American Mineralogist, Volume 75, pages 1431-1437, 1990

NEW MINERAL NAMES*

JOHN L. JAMBOR CANMET, 555 Booth Street, Ottawa, Ontario KIA OGI, Canada ERNST A. J. BURKE Instituut voor Aardwetenschappen, Vrije Universiteite, De Boe1e1aan 1085, 1081 HV, Amsterdam, The Netherlands

Cervelleite* the Laboratoire de Mineralogie et Cristallographie, Uni- versite Pierre et Marie Curie, Paris, currently chairman A.J. Criddle, J.E. Chisholm, c.J. Stanley (1989) Cervel- leite, Ag4TeS, a new mineral from the Bambolla mine, of the Commission on Ore Mineralogy (IMA). The type Mexico, and a description of a photo-chemical reaction specimen is preserved at the British Museum (Natural involving cervelleite, , and hessite. Eur. J. History). E.A.J.B. Mineral., 1,371-380. The average of eight electron-microprobe analyses gave Edgarbaileyite* Ag 73.0, Cu 0.1, Te 22.2, S 5.3, total 100.6 wt%, leading A.c. Roberts, M. Bonardi, R.C. Erd, AJ. Criddle, CJ. to a formula Ag3.99CUO.OlTe1.o2So.97,ideally A~ TeS. Least- Stanley, G. Cressey, R.J. Angel, J.H.G. Laflamme (1990) squares refinement of 13 lines from an X-ray powder Edgarbaileyite, the first known silicate of mercury, from photograph (114-mm camera, Cu radiation) indexed on California and Texas. Mineral. Record, 21, 215-220. a primitive cubic unit cell, unknown, gave a The mineral has been identified in material from the = 14.03(1) A; with Z = 24, Deale= 8.53(2) glcm3. The Socrates mine, Sonoma County, California (type locali- strongest X-ray difITaction lines (15 listed) are 6.29(s,012), ty), the Clear Creek claim, San Benito County, California, 5.00(vvs,022), 4.64(m,122,003), 4.24(vs,113), and and in a museum specimen labeled as from Terlingua, 3.766(ms,123). In composition, the mineral is the Te an- Brewster County, Texas. Electron microprobe analysis of alogue of aguilarite and is similar to mineral Z of Akse- the mineral from Terlingua gave Hg 87.5, Si 3.7, Oeale7.8, nov et al. (1969), mineral B of Karup-M011er (1976), and sum 99.0 wt%, corresponding to Hg6.2Si1.906.9,ideally the unnamed (Ag,Cu)4TeS mineral of Gadzheva (1985). H~Si207; analyses of the mineral from the Socrates mine Cervelleite was found in the same polished section as gave similar results. The infrared spectrum does not show benleonardite (Am. Mineral., 73, p. 439, 1988); the spec- the presence of OH or H20. In specimens from the Soc- imen was collected from the waste dumps of the Bam- rates mine and from the Clear Creek claim, the mineral bolla mine, Moctezuma, Sonora, Mexico. Cervelleite oc- occurs as thin crusts on surfaces, as disseminated curs as thin (30-~m) rims surrounding irregular inclusions round to mammillary masses in small cavities, and as of finely granular acanthite in hessite. Other associated hollow mammillary modules; it occurs in the Terlingua minerals are native , , and . The specimen as cryptocrystalline aggregates and as sheaves paragenesis occurs with dolomite and as thin (1- of platy crystal aggregates up to 2 x 2 mm, individually 2 mm) black and crumbly fracture fillings in a highly up to 200 ~m and showing dominant {l00}, polysyn- altered silicified rhyolite vitrophyre. thetically twinned on {l00}. Lemon yellow to orangish Cervelleite in a freshly polished section in reflected light yellow when fresh, photosensitively darkening to dark ol- is slightly bluish white to slightly greenish white, is iso- ive green, yellowish green, or dark green-brown. tropic, and has a reflectance lower than that ofhessite but pale green with a yellowish tinge, luster vitreous (crystals) higher than that of acanthite; no internal reflection. Re- to resinous (masses), translucent (crystals) to opaque flectancevalues(WTiCstandard)Rand imR are givenin (masses), H = 4, VHNlOo= 192 (153-217), Dme..= 9.4(3), lO-nm steps; standard values are (nm, %) 470,39.8,23.8; Deale= 9.11 glcm3 with Z = 2. Readily soluble in dilute 546,38.15,22.15; 590, 37.0, 21.1; 650, 35.6,19.9. Color HCl. Optically biaxial, with maximum and minimum values (for CIE illuminant C) are x 0.302, y 0.311, Y% calculated refractive indices of 2.58 and 2.10 (590 nm); 37.8, Ad 482, Pe% 3.5. No , irregular fracture, lemon yellow color and weakly pleochroic in transmitted VHNIO = 26. The mineral is difficult to identify in pol- light. Gray in reflected light, strongly bireflectant, non- ished section because its appearance is rapidly changed pleochroic; Rl and R2 are given in lO-nm steps in air and by a profound photochemical surface reaction with acan- oil. X-ray structural study indicated monoclinic sym- thite and hessite. metry, space group C2/m, a = 11.725(4), b = 7.698(2), c ) of The name is for Dr. Bernard Cervelle (1940- = 5.967(2) A, (3= 112.07(3)° as refined from a Guinier- de Wolff powder pattern (Co radiation). Strongest lines of the pattern are 6.28(20,110), 3.160(100,021), * Before publication, minerals marked with an asterisk were approved by the Commission on New Minerals and Mineral 2.952(34,202), 2.765(20,002), 2.715(63,400), 2.321- Names, International Mineralogical Association. (24,421), and 1.872(36,b02). 0003-004X/90/1112-1431$02.00 1431 -----..------

1432 JAMBOR AND BURKE: NEW MINERAL NAMES

Associated minerals in the Terlingua specimen are ideally (Cu,Fe,Zn,AgMSn,In)S4 where In is thought to be montroydite, terlinguaite, eglestonite, and native mercu- an essential constituent. In reflected light, brown in air ry in cavities and fractures in a matrix of , quartz, and greenish brown in oil, becoming increasingly gray and barite. Associated minerals in the specimens from with increased zinc content. Faint greenish brown reflec- California are quartz, native mercury, cinnabar, and tion in oil, weak bireflection. Reflectance montroydite; several new, but as yet undescribed, Hg- percentages for R, and R2 in air are 470 27.0, 27.0; 546 bearing minerals are present in material from the Clear 27.8,27.7; 589 27.6, 27.5; 650 27.4, 27.1. VHNlOo = 319 Creek locality. The new name is for Dr. Edgar Herbert (296-353); distinct {l1O}, {l00}, and {01O} cleavages, Bailey (1914-1983), geologist and mercury commodity {001} parting. X-ray single-crystal study indicated ortho- specialist for the U.S. Geological Survey. Holotype ma- rhombic symmetry, space group Pmn2, (by analogy with terial is in the National Mineral Collection at the Geo- the enargite structure); a = 7.6671(81), b = 6.4399(32), C logical Survey of Canada, Ottawa. J .L.J. = 6.2605(61) A (Herb claim) by refinement of the powder pattern (114.6-mm Gandolfi camera, Co radiation); strongest lines are 3.13(100,002), 2.712(40,121), Ferrokesterite*, Petrukite* 1.915(60,400), 1.636(50,402), 1.243(50,151), and 1.106( 60,315). The new name is for William Petruk S.A. Kissin, D.R. Owens (1989) The relatives of stannite (1930- ), mineralogist at the Canada Centre for Min- in the light of new data. Can. Mineral., 27, 673-688. eral and Energy Technology (CANMET), Ottawa, Cana- Ferrokesterite. The most Fe-rich of three electron-mi- da, who noted the possible existence of the mineral in his croprobe analyses gave Cu 29.5, Fe 8.7, Zn 5.0, Mn 0.1, studies of the Mount Pleasant ores. Metatype specimens Cd 0.1, Sn 27.4, S 30.1, sum 100.9 wtOfo,corresponding have been deposited in several institutions, and cotypes to CUl.99(Feo.67ZnO.33)~l.OOSn099S4.02' ideally Cu2FeSnS4 for in polished sections are in the National Mineral Collec- the end-member, which is the Fe analogue of kesterite. tion at the Geological Survey of Canada, Ottawa. J.L.J. Steel gray, metallic luster, black streak, H = 4, VHNlOo = 238 (228-255), distinct {110}cleavage, {001} parting, Deale Hemloite* = 4.490 glcm3 with Z = 2. In reflected light, medium gray and indistinguishable from kesterite; in oil, faint re- D.C. Harris, B.F. Hoskins, I.E. Grey, A.J. Criddle, c.J. flection pleochroism in shades of gray. Weakly anisotrop- Stanley (1989) Hemloite (As,SbMTi,V,Fe,Al)120230H: ic and bireflectant; reflectance values in air for Ro and A new mineral from the Hemlo gold deposit, Hemlo, R" are 470 23.9, 26.8; 546 26.0, 27.0; 589 26.3, 27.3; 650 Ontario, and its . Can. Mineral., 27, 427-440. 26.0, 26.8. X-ray single-crystal study indicated tetragonal symmetry, space group 14 (by analogy with kesterite); a A representative electron-microprobe analysis (one of = 5.433(36), C= 10.884(89) A as refined from the powder five listed) gave AS203 12.5, Sb203 5.8, Ti02 38.1, V203 pattern (114.6-mm Gandolfi camera, Co radiation). 13.4, Fe203 26.7, Al203 1.4, sum 97.9 wtOfo,correspond- Strongest lines of the powder pattern are 3.13(100,112), ing to (As2.98Sbo.940) (Ti'l.25 V4.22Fei.t,FeU7Aso.65)046(OH)2. 2.712(30,020,004), 1.919(60,220,024), 1.110(40,244,228), The presence ofOH groups is indicated by X-ray crystal- 1.045(30,336,152), and 0.9182(30,156,352), similar to structural study, the valence states of Ti and V are in- those of the synthetic counterpart. The mineral occurs in ferred from structural analogy with the related minerals greisen-bordered veins in granite at the Cligga tomichite and derby lite, and Fe2+-Fe3+ is apportioned ac- mine, Cornwall, England. Type material is in the Nation- cording to charge-balance requirements. The mineral oc- al Mineral Collection at the Geological Survey of Canada, curs as opaque, subhedral to anhedral grains up to 400 Ottawa, and at the British Museum (Natural History), x 600 Mm, black streak, metallic to submetallic luster, London, England. VHNlOo = 913(858-967), no cleavage, curved to irregular Petrukite. The mineral occurs within massive fracture, Deale= 4.613 glcm3 with Z = 2. In reflected light, and sphalerite as round grains up to 240 Mm in diameter not pleochroic or bireflectant, very weakly anisotropic at the Herb claim, Cassiar District, British Columbia; as from dark gray to dark brown. Reflectance values (SiC layers about 200 Mm wide, with sphalerite, sakuraiite, standard) are given in 20-nm steps; representative values , cassiterite, and in a polished (nm, R, and R2 in air and in oil, respectively) are 470 section of material from the Ikuno mine, Hyogo Prefec- 17.7,18.5,5.91,6.27; 546 17.1, 17.8,5.48,5.82; 589 ture, Japan; as grains up to 400 Mm in diameter in quartz 16.9, 17.5, 5.38, 5.67; 650 16.8, 17.35, 5.31, 5.59; color with associated chalcopyrite at the Fire Tower North ore values (illuminant C) YOfo 17.1, 17.8; Ad473, 474; Pe% body, Mount Pleasant, Charlotte County, New Bruns- 2.6, 3.2. Single-crystal X-ray study indicated triclinic wick. The mean and (range) of eight electron microprobe symmetry, space group pI, a = 7.552(1), b = 15.842(2), 7.158(1) A, a = 78.36(1), (1 analyses of material from the Herb claim gave Cu 27.4 C = = 84.97(1), 'Y = 86.78(2)°. (27.3-28.0), Ag 0.9 (0.4-1.2), Fe 12.4 (12.0-12.9), Zn 3.6 The X-ray powder pattern was indexed with a = 7.158, (3.1-4.5), Cd not detected, Sn 24.8 (24.3-25.3), In 1.3 b = 7.552, C= 16.014, a = 89.06, {1= 104.32, 'Y= 84.97° (0.9-1.9), S 29.9 (29.6-30.3), sum 100.3 wtOfo,corre- to show the relationship to tomichite; strongest lines sponding to (Cu ,.85A~.03F eo. 95Zllo.24)~3.o7(Sno.89Ino.o5)ID.94S3.99' (114.6-mm Debye-Scherrer camera, Cu radiation) are JAMBOR AND BURKE: NEW MINERAL NAMES 1433

3.045(70,211,122), 2.924(100,114), 2.799(80,122), The name is for Ferdinand Lehner (1868-1943) from 2.722(90,214), 2.665(90,222), 2.498(70,110), 1.774- Pleystein, one of the first collectors of Hagendorf min- (60,128,216), 1.579(60B,243,3j 1,325), and 1.508(60, erals. Another mineral previously named lehnerite was 431,425,038). The structure was refined to R = 5.26%. shown to be ludlamite by Berman (Am. Mineral., 10, The mineral occurs in two samples of a drill core from 428-429, 1925). Location of the type material is not in- the Page-Williams gold mine at Hemlo, 35 km east of dicated but apparently is with the author at the Univer- Marathon, Ontario, near the northeastern shore of Lake sity of Gottingen. Superior. Some of the grains contain inclusions of pyrite Discussion. The author does not mention whether there and molybdenite, and others form rims on rutile, all in a is a relation to "fritzscheite," supposedly a manganese matrix of quartz and barian microcline containing sphal- uranium phosphate in the torbernite group (Dana's Sys- erite, molybdenite, vanadian , and sparse ar- tem, 7th ed., vol. 2, 984). E.A.J.B. senopyrite. The new name is for the locality. Type ma- terial is in the British Museum (Natural History), London, England, and in the part of the National Mineral Collec- tion housed at the Geological Survey of Canada, Ottawa, Magnesioaubertite* Canada. J .L.J. G. Gebhard, O. Medenbach, W. Gebert (1988) Magne- sioaubertite, (Mg,Cu)Al(S04)2Cl. 14HzO, a new chlo- rosulfate from Vulcano, Lipari Islands. Aufschluss, 39, 97-102 (in German). Lehnerite* Wet-chemical analysis of the water-soluble but not hy- A. Miicke (1988) Lehnerite, Mn[UO/P04k8H20, a new groscopic sulfate gave CuO 5.5, MgO 3.38, Al203 13.91, mineral from the Hagendorf , Oberpfalz. S03 28.25, Cl 7.6, H20 44.0, 0 ;; Cl1.71, total 100.93 Aufschluss, 39, 209-217 (in German, English abstract). wt%; on the basis of S + Cl = 3.00, the formula is Electron microprobe analysis gave MnO 7.5, FeO 0.2, (M&.44CUo.37Alo.19)nooAI1.2sS1.s70s.Q2Cl1.13'12.92HzO, ide- U03 63.0, P20S 15.1, H20 (by difference) 14.2, sum 100.0 ally (Mg,Cu)Al(S04)2Cl'14H20. Single-crystal X-ray study wt%, corresponding to (MIlo.993FeO.026)~I.019[(U02)I.03s1P04J2' proved the isotypic relation with aubertite (Am. Mineral., 7.414H20 on the basis ofP20s = 1.000; ideally Mn[UO/ 65, p. 205, 1980): triclinic symmetry, space group pI, a P04k8H20, the Mn analogue ofbassetite. Single-crystal = 6.31(1), b = 13.20(2), c = 6.29(1) A, a = 91.7(2), (3 = X-ray study indicated monoclinic symmetry, space group 94.5(1),'Y = 82.6(1)°as refinedfrom the powderdiffrac- P2/n, a = 7.04(2), b = 17.16(4), c = 6.95(2) A, (3= 90.18° tion pattern (114-mm camera, Cu radiation), Z = 1, Deale as refined from the powder diffraction pattern (Fe radia- = 1.78, Dmeas= 1.80(3) glcm3. The strongest lines (46 tion), Z = 2, Deale= 3.717 for the empirical formula, Dmeas listed) of the powder pattern are 4.50(100,II 1), = between 3.5 and 3.6 glcm3. The strongest lines (19 3.97(80,121,1 11),5.61(70,011),4.25(60,120),3.68- listed) of the powder pattern are 8.56 (100,020), (60,121), 6.26(50,001), 4.81(50,120), 3.12(50,002, 4.96(60, I 0 1), 3.50(80B,200,002), 2.48(30,202, I 61), 210,200), and 2.696(50,141). 2.23(70,301), 2.17(30,330,113), and 1.746(30, I 63, Magnesioaubertite occurs as polycrystalline aggregates, 272,163). always enclosed by pickingerite, on a base of alunogen in Lehnerite occurs with decomposed zwieselite and a cave (Grotta de Faraglione) at Porte de Levante, on the strongly corroded rockbridgeite on the 67-m level in the island Vulcano of the Lipari group, north of Sicily, Italy. pegmatite ofHagendorf-Siid, Oberpfalz, Germany. In the The aggregates are up to 2 cm and consist ofxenomorphic same paragenesis occur fluellite, carlhintzeite, morinite, granular single crystals several hundred micrometers in and pachnolite. Lehnerite forms thin pseudotetragonal diameter. The mineral is transparent and has a sky blue crystals up to 1 mm, platy along (010) with a layered color resembling that of chalcanthite; white streak, glassy structure perpendicular to [010]; other forms present are luster, good {01O} cleavage, H = 2-3. Synthetic Cu-free {OOI}, {l OO}, {l0 l} and {IO l}. Color bronze yellow to magnesioaubertite is white. Optically biaxial negative, a yellow, streak whitish yellow, luster glassy to nacreous, = 1.466(1) colorless, (3= 1.481(1) light blue, 'Y= 1.4875(5) cleavage perfect {01O},less perfect {101}, {I0l} and {l00}, light blue, 2Vz = 112° (meas.) and 114° (calc.), r > v, na H = 2-3, nonfluorescent. Optically, biaxial negative, a = /\ (010) = 17(1)°. The compatibility index [1 - K/KJ is 1.599(2), (3= 1.607(2), 'Y = 1.607(2)at 589 nm, 2V = 0.015, "superior." 45°, X = b, Y:a = 8-10°, Z:c = 8-19°, r > v (strong), The new name is for the composition and the analogy weakly pleochroic in shades of yellow (Z darker than Y). with aubertite. Associated minerals are metasiderona- Toward the borders of the crystals, 2 V becomes smaller trite, native , aluminocopiapite, and metavoltine. and the extinction more oblique; in the outermost rim of Type material is preserved in the collections of the Min- the crystals, the axial plane is perpendicular to that in the eralogical Institute of the Ruhr University at Bochum, center of the crystals; intermediate zones are uniaxial. Germany. This phenomenon is probably related to the variable H20 Discussion. The mineral is also the chlorine analogue contents in the crystals. of svyazhinite (Am. Mineral., 70, 877, 1985). E.A.J.B. -

1434 JAMBOR AND BURKE: NEW MINERAL NAMES

Voggite* Natural magneIi phases, AlTi phases A and B AC. Roberts, AP. Sabina, T.S. Ercit, J.D. Grice, J.T. A.K. Pedersen, J.G. R0nsbo (1987) Oxygen deficient Ti Szymanski, R.A Ramik (1990) Voggite, a new hydrat- oxides (natural magneli phases) from mudstone xeno- ed Na-Zr hydroxide-phosphate-carbonate from the liths with native from Disko, central West Green- Francon quarry, Montreal, Quebec. Can. Mineral. 28, land. Contrib. Mineral. Petrol., 96, 35-46. 155-159. ' The xenoliths are black, very fine grained, carbona- The ideal formula from X-ray crystal-structure analysis ceous mudstones that occur at Asuk on northern Disko is NazZr(P04)(C03)(OH).2HzO, requiring NazO 17.95, Greenland, in a strongly reduced andesite breccia with ZrOz 35.69, PzO, 20.56, COz 12.75, HzO 13.05 wt%. native Fe. The xenoliths, up to 12 x 10 x 6 cm in size, TGA-EGA gave COz 12(2), HzO 15(2) wt%, and electron- are slightly rounded and contain up to 2.3 vol% organic microprobe analysis confirmed the presence of major fragments, mainly vitrinite and inertinite. Pyrometa- amounts of Na, Zr, and P and the presence of C; rapid morphism has affected the xenoliths; tiny droplets of me- loss of HzO under the electron beam and the small size tallic Fe have formed, always surrounded by a rim of of the grains prevented quantitative analyses. The min- troilite(?). Original clastic grains of Fe- Ti oxides have eral occurs as matted nests, millimeters in size, of col- completely reequilibrated to newly crystallized aggregates orless crystals averaging 1 x 0.01 x 0.01 mm, elongate up to 80 1-£min size. The aggregates consist of one or [010], showing major {l00} and {l01}, and minor {001}. several magneli phases and of AI-Ti oxide phases. White streak, vitreous luster, brittle, poor {01O} cleavage, Magneli phases. These phases of Ti oxide have a dis- nonfluorescent, Dmeas= 2.70(2), Deale= 2.704 g/cm3 for the ideal formula and Z = 4. Optically biaxial positive, tinct bluish color and are strongly anisotropic in reflected light. They occur as cores of zoned grains and as aggre- a = 1.569(1), (3= 1.594(1), 'Y= 1.622(1), 2 Vme..= 81(5)°, 2Veale= 88°, strong , r < v, X = b, Z /\ a = gated prismatic or irregular grains. All types show lamel- lar twinning, and variable blue colors (blue, grayish blue, 22° in the obtuse (3angle. X-ray study indicated the min- light blue) indicate compositional variations. Electron- eral to be monoclinic, space group 121m; a = 12.251(5), microprobe analyses (with conditions extensively dis- b = 6.557(3), c = 11.755(5) A, (3= 116.12(4)° as refined from a 114.6-mm Debye-Scherrer powder pattern (Cu cussed in an appendix) show a summation well above radiation) with strongest lines of 10.2(100,101), 100 wt% when Ti is calculated as TiOz, with the highest 5.58(80,011,200),4.06(60,301), 3.89(65,103), 3.28- total being 105.1%. These high totals contrast markedly (60,020), 3.181(35,310,202), 3.05(35,402), 2.546(40,404), with the totals close to 100% found for AlTi phase A in and 2.039(40,204,305,002). the same grain aggregate. The high totals are taken as The mineral occurs in cavities of centimeter size in an evidence for the presence of considerable amounts ofTi3+ altered, younger amygdaloidal basalt dike adjacent to its in the blue oxides. Recalculation of the analytical totals contact with a silicocarbonatite sill at the Francon quarry, to 100% through an adjustment of parts of TiOz to Tiz03 Montreal, Quebec. Associated cavity minerals are quartz, places the blue oxides within the range of the homologous calcite, and dawsonite. The new name is for Adolph Vogg, series TinOzn-1 (4 :5 n :5 9) called magneli phases, a series a local amateur mineralogist who discovered the mineral. of structurally interrelated triclinic compounds derived Type material is in the National Mineral Collection at from the rutile structure by a crystallographic shear plane parallel to (121). The analyses show compositions which the Geological Survey of Canada, Ottawa. J .L.J. correspond to the range TiO 1.7I to Ti01.83, from slightly more reduced than the phase Ti407 to the phase Ti6011, and one analysis corresponds to the phase Ti9017' Several anomalous blue "rutile" minerals have been described from meteorites and from lunar rocks, but the Vanadium-titanium carbide Disko material constitutes the first description of magneli J. Jedwab, J. Boulegue (1989) A vanadium-titanium car- phases as minerals. bide inclusion in graphite from hydrothermal ejecta at AlTi phases A and B. AITi phase A has a gray color l3°N, East Pacific Rise. Can. Mineral., 27, 617-623. and optically resembles normal rutile. Phase A occurs as Electron microprobe analysis of a triangular inclusion, reaction rims on magneli phases or as discrete grain ag- about 1 x 5 1-£m,in graphite collected in a sediment trap gregates where the reaction has gone to completion. Elec- moored near active hydrothermal vents at l3°N, EPR, tron microprobe analyses show a considerable composi- gave Ti 35.65 and V 46.74 wt%, major C (17.61 wt% tional zonation and a substantial compositional intergrain calc.), Nand S absent, 0 detected but in insufficient variation. Two analyses yielded SiOz 0.16, 0.09, TiOz amounts to form a pure oxide or oxyhydroxide. Based on 88.44,91.17, NbOz n.d., 0.08, Alz03 6.27, 4.29, VP3 comparisons with synthetic V-C and Ti-C systems, the 0.26,0.70, CrZ03 0.18, n.d., FeO 0.75, 1.46, MnO 0.10, results are interpreted to represent a cubic (V,Ti)C phase, n.d., MgO 3.24, 2.60, total 99.40, 100.39 wt%. Formulas analogous to khamrabaevite (Ti,V)C. The inclusion may calculated on the basis of 1 cation show a distinct 0 def- have formed during serpentinization ofC-bearing basalt. icit compared to ideal TiOz, with 0 contents between J.L.J. 1.85 and 1.90. AlTi phase A may structurally be related JAMBOR AND BURKE: NEW MINERAL NAMES 1435 to the magneli phases; formula calculation on this basis Wicksite-like phase fits A12_ATi6!(Mg,Fe)o.5]xTi~~202n_l' with x varying be- R. Ek, P. Nysten (1990) Phosphate mineralogy of the tween 1.3 and 0.9 and n between 6 and 14. HiUsjoberg and Hokensiis deposits. Geol. For- AlTi phase B is pale orange and occurs as blebs (1.5- en. Stockholm Forh., 112,9-18. 2 ~m) within some grains of magneli phases. Phase B is characterized by a high A1203 content, about 17 wt%, and At Hiilsjoberg, near Torsby, Varmland, Sweden, kya- has a comparatively high Ti3+ content. Based on 7 0 at- nite-bearing siliceous rock resembling quartzite contains oms, the ideal formula is AlTi3+Ti~+07' The absence of a complex assemblage of phosphates that includes lazu- X-ray and TEMdata and of known synthetic Al analogues lite-scorzalite, trolleite, augelite, gatumbaite, , makes further conclusions on the AlTi phases specula- burangaite, ferrowyllieite, and a wicksite-like phase. Nine tive. electron-microprobe analyses indicate that the wicksite- The inferred temperature of oxide equilibration is like mineral is probably the same as that from South > 1160 °C to ?1200 °C, but formation started at < 1000 Dakota described by Peacor et al. (Can. Mineral., 23, °C; equilibration took place under pressures of < 10 bars; 247-249, 1985), which may be the Mn analogue of inferredfo2 was about 10-[5 to 10-[6 at 1200 °C, 4-5 log wicksite. Mossbauer spectra of the mineral from Sweden units below the Fe-W 0 buffer. E.A.J.B. indicate two Fe2+and one Fe3+positions in the mineral, thereby leading to the newly proposed formula (Ca,NaMMn,Fe,Mg).{Fe,AIMPO')6'4H20. J.L.J. Unnamed Pb chlorosulfosalts Y. Moelo, O. Balitskaya, N. Mozgova, A. Sivtsov (1989) Chlorosulfosalts from the lead- mineraliza- Monoclinic polymorph of SiO, tion ofCougnasses (Hautes-Alpes). Eur. J. Mineral., 1, G. Miehe, H. Graetsch, O.W. Florke, H. Fuess (1988) 381-390 (in French, English abstract). The monoclinic crystal structure of the Si02-mineral Massive semseyite in Pb-Sb mineralization at Coug- moganite. Zeits. Krist., 182, 183-184 (in German). nasses (Hautes-Alpes, France) contains, along a slicken- A monoclinic microcrystalline silica polymorph from side, a cryptocrystalline product of millimeter size gen- Gran Canaria was described as a new mineral by Florke erated by crushing. The material shows a flow texture and et al. (Neues Jahrb. Mineral. Abh., 149,325-326, 1984), consists of boulangerite, , and two chlorosul- but in contravention of internationally adopted proce- fosalts (minerals C and C[), but these minerals cannot be dures (Am. Mineral., 70, p. 874, 1985). In 1986 an or- distinguished under the microscope. thorhom bic structure was inferred on the basis of electron- Mineral C. Electron microprobe analyses gave on av- diffraction evidence for the existence of a glide plane. erage Pb 46.56, Ag 0.85, Cu 0.09, Sb 30.46, As 0.88, S However, crystal-chemical considerations, electron dif- 19.83, Cl 0.90, total 99.57 wt%, corresponding to fraction, and Rietveld refinement of neutron and X-ray [Pb 15.iA&.6CUo. 1)Sbo.7 ]~17.1(Sb16.7Aso.s)~17.5S'3.2Cl[.s, ideally data show that the symmetry is only monoclinic, with a Pb[7SblsS.3Cl2.The X-ray powder pattern of the mineral triclinic supercell having a volume double that of the (Guinier-de Wolff camera, Co radiation) shows a limited primitive unit cell. A new setting is proposed in order to number of diffuse lines (24 listed); the strongest are show better the analogies with the quartz structure: space 4.08(20), 3.85(50), 3.54(100), 2.82(30), and 2.067(100). group Il2/al, a = 8.770(2), b = 4.879(1), c = 10.720(2) Electron microdiffraction shows a 4-A periodicity along A, fJ= 90.08(4)°, V = 458.7(3) A3.The relation to quartz b, often with a superstructure doubling this periodicity, is 2a + b, b, 2c (a, b, and c of quartz). The structure and two other periodicities of 45 A and 21 A. Mineral C consists of corner-linked SiO. tetrahedra with 6-mem- is very similar to the synthetic phase V of Bortnikov et bered, 8-membered, and 4-membered rings. The three al. (1979); both compounds may be structurally related Si-O-Si angles are 147, 146, and 136°; the tetrahedra to playfairite through a coupled substitution Sb3++ S2- are only slightly distorted; the average Si-O distance is ~ Pb2+ + Cl'-, a mechanism already proposed for dad- 1.614 A. sonite. Discussion. It is not appropriate to persist in using a Mineral Ct. The average of two electron microprobe disapproved name. The authors might consider submit- analyses gave Pb 49.4, Ag 2.2, Cu 0.1, Sb 27.1, As 0.2, ting a new proposal to the Commission on New Minerals S 19.1, Cl 0.9, total 99.0 wt%, leading to a formula and Mineral Names. E.A.J .B. (on the basis of 21 anions) Pbs.o5(A&.6sCuo.o5)~o.73(Sb7.49- ASo.o7b.56S2o.13Clo.s7,or ideally PbsAgSbsS2oCl.No other natural or synthetic sulfosalt chemically resembles this BaAI2Si20g.4H20 compound. The minerals were formed by a reaction of earlier sul- U.H. Jakobsen (1990) A hydrated barium silicate in un- fosalts with Cl-rich solutions. It would be interesting to metamorphosed sedimentary rocks of central North Greenland. Mineral. Mag., 54,81-89. know more about the threshold of salinity, as a function of temperature, that is needed to form such chlorosulfo- Unmetamorphosed Lower Cambrian to Lower Siluri- salts adjacent to the more common sulfosalts. E.A.J.B. an, black organic-rich cherts in the Navarana Fjord area, -----

1436 JAMBOR AND BURKE: NEW MINERAL NAMES

North Greenland, contain hyalophane, barite, and a hy- Chaidamuite drated barium silicate for which electron-microprobe W.-M. Li, Q.-G. Wang (1990) Determination and refine- analysis gave BaO 29.66, Na20 0.18, K20 0.45, A1203 ment of the crystal structure of chaidamuite. Science in 23.49, Si02 29.05, sum 82.83 wt%, corresponding to China (Ser. B), 33(5), 623-630 (in English). (Bao.s.Ko.o.Nao.o2)~o.90AI2.ooSi2.02;assuming H20 to account for the low analytical totals, formula H20 varies from 3 X-ray crystal-structure study of chaidamuite, to 5.5 and averages 4. The ideal formula thus is Ba- ZnFe(SO.MOH)'4H20, from the type locality in China, AI2Si20s' 4H20. The mineral is < 100 ~m in size and is showed the mineral to be triclinic, space group PI, a = anhedral platy to fan-shaped with a pronounced cleavage. 7.309(2), b = 7.202(2), c = 9.691(3) A, a = 89.643, (J = J.L.J. 105.89(3), 'Y = 91.11(2)°, Z = 2, Dmeas= 2.722, Deale= 2.724 glcm3, R = 3.2%. All dimensions are similar to those reported previously for monoclinic symmetry (Am. Sakhaite-like mineral Mineral., 73, p. 1493, 1988), on which basis chaidamuite was considered to be isostructural with guildite, P.1. Dunn, D.R. Peacor, J.A Nelen, R.A Ramik, J. Innes (1990) A sakhaite-like mineral from the Kombat Mine CuFe(SO.MOH).4H20. Chaidamuite is only pseudo- in Namibia. Mineral. Mag., 54, 105-108. monoclinic, and it is suggested that the structure of guild- ite should be examined, as it too may be triclinic. J.L.J. Electron-microprobe, wet-chemical, and TG-EG anal- yses of the unaltered core a crystal from the Kombat mine, Tsumeb, Namibia, gave CaO 46.4, MgO 11.7, Al203 1.3, Davyne Si02 6.2, B203 15.9, C02 12.6, H20 4.8, sum 98.9 E. Bonaccorsi, S. Merlino, M. Pasero (1990) Davyne: Its wt%, corresponding to Ca23.51Mgs.25(B03M(B03)..98- structural relationships with cancrinite and vishnevite. AlonSi29301L15](C03)813.7.57H20. The ideal formula is Neues Jahrb. Mineral. Mon., 97-112. given below in relation to harkerite and sakhaite: Energy-dispersion and X-ray crystal-structural analyses harkerite: Ca2.Mgs(B03MAlSi.(O,OH)'6JlC03MH20,Cl) of davyne indicate that the mineral is hexagonal, space group P6/m, a = 12.705(4), c = 5.368(3) A. The empir- sakhaite: 2{Ca2.Mgs[(B03MB03)s](C03MH20)} sakhaite-like mineral: ical formula is (Na..4K1.5Cao.l)CalSi59A16102.)(SO.)o6CI2s, ideally Na.K2Ca2Si6AI602.(SO.)Cl2'J.L.J. 2 (Ca2. Mgs(B03)s {(B03)y [AlSi.(O,OH)< 16]x}(C03)s. <8H20) where x = 0.73 and y = 5.0. X-ray single-crystal study of the sakhaite-like mineral in- Robinsonite dicates that it is cubic and its space group is a subgroup A Skowron, J.D. Brown (1990) Refinement ofthe crystal of Fd3m (like that of sakhaite, whereas harkerite is tri- structure of robinsonite, Pb.Sb6S13' Acta Crystallogr., gonal). Aside from the significant substitution of B03 C46, 527-531. groups by aluminosilicate, which is beyond that previ- X-ray crystal-structure determination of synthetic rob- ously known for sakhaite, the sakhaite-like mineral also insonite gave monoclinic symmetry, space group 121m, contains a high H20 content that is not released until a = 23.698(8), b = 3.980(8), c = 24.466(8) A, {J= 93.9°, relatively high temperatures. The Kombat mineral may Z = 4, Deale= 5.7 glcm3, Rw = 6.4%. The cell dimensions be new, but naming is deferred because the relations be- and symmetry are new. J.L.J. tween symmetry and crystal chemistry are complex and incompletely defined for these types of minerals. J.L.J. Volkovskite J.A Mandarino, AL. Rachlin, P.J. Dunn, Y. Le Page, M.E. Back, B.L. Murowchick, R.A Ramik, R.B. Falls (1990) Redefinition of volkovskite and its description from Sussex, New Brunswick. Can. Mineral., 28, 351- New Data 356. Electron-microprobe, wet-chemical, and TG-EG anal- Berndtite po1ytypes* yses of almost micaceous, pink to colorless, pseudohex- agonal plates, tabular {01O}, that occur in Mississippian P. Bayliss (1990) Mineral nomenclature: Berndtite poly- evaporites ofthe Windsor Group in southern New Bruns- types. Mineral. Mag., 54, 137. wick, Canada, gave K20 3.8, CaO 17.5, SrO 0.4, B203 The two naturally occurring polytypes of berndtite 60.5, Cl 2.8, H20 13.5,0 ==Cl 0.6, sum 97.9 wt%, cor- (SnS2), previously referred to as C6 (the trigonal phase) responding to K1.o, (Ca3.91 SrO.05)~3.96B21.770'6.0' H,s.77Clo.99, and c27 (the hexagonal phase), are renamed berndtite-2T ideally KCa.[B50s(OH).][B(OH)3]Cl.4H20 as shown by and berndtite-4H, respectively. J.L.J. X-ray crystal-structure analysis. Transparent, vitreous JAMBOR AND BURKE: NEW MINERAL NAMES 1437 luster, white streak, brittle, nonfluorescent, H = 2112,per- Discredited Mineral fect {O1O}cleavage, Dmeas= 2.27(3), Deale= 2.28 glcm3 for the analytical and theoretical formulas with Z = 1. Op- Isostannite* tically biaxial positive, ex= 1.523, {3= 1.530, 'Y= 1.596, 2 Veale= 37°. X-ray single-crystal study indicated triclinic S.A. Kissin, D.R. Owens (1989) The relatives of stannite symmetry, space group PI, a = 6.580, b = 23.937, c = in the light of new data. Can. Mineral., 27,673-688. 6.521 A, ex= 90.40, (3 = 119.09, 'Y = 95.67°, as refined Holotype isostannite from Cligga Head, Cornwall, En- from a powder pattern with strongest lines of gland, and topotype specimens from Zinnwald, Czecho- 11.89(70B,020), 7.91(90,030),5.40(70,110),3.39(60,070), slovakia, and the Snowflake mine, Revelstoke, British 3.26(100,102), and 2.641(60,090). The chemical formula Columbia, were reexamined by optical microscopy, elec- and unit cell are new. A specimen of the mineral from tron-microprobe analyses, and X-ray powder diffraction the New Brunswick locality has been designated as neo- patterns. The results indicate that isostannite is a member type material and is deposited in the Royal Ontario Mu- of the kesterite-ferrokesterite solid-solution series. The seum, Toronto, Canada. J.L.J. discreditation was approved by the IMA. J.L.J.