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New Mineral Names* American Mineralogist, Volume 71, pages 227-232, 1986 NEW MINERAL NAMES* PETE J. DUNN, GEORGE Y. CHAO, JOAN J. FITZPATRICK, RICHARD H. LANGLEY, MICHAEL FLEISCHER, AND JANET A. ZILCZER Caratiite* sonian Institution. Type material is at the Smithsonian Institu- tion under catalogue numbers 149811 and 150341. R.H.L. A. M. Clark, E. E. Fejer, and A. G. Couper (1984) Caratiite, a new sulphate-chloride of copper and potassium, from the lavas of the 1869 Vesuvius eruption. Mineralogical Magazine, 48, Georgechaoite* 537-539. R. C. Boggs and S. Ghose (1985) Georgechaoite NaKZrSi309. Caratiite is a sulphate-chloride of potassium and copper with 2H20, a new mineral species from Wind Mountain, New Mex- ideal formula K.Cu402(S04)4MeCl (where Me = Na and/or Cu); ico. Canadian Mineralogist, 23, 1-4. it formed as fine green acicular crystals in lava of the 1869 erup- S. Ghose and P. Thakur (1985) The crystal structure of george- tion ofMt. Vesuvius, Naples, Italy. Caratiite is tetragonal, space chaoite NaKZrSi309'2H20. Canadian Mineralogist, 23,5-10. group 14; a = 13.60(2), c = 4.98(1) A, Z = 2. The strongest lines of the powder pattern are fdA, 1, hkl]: 9.61(100)(110); Electron microprobe analysis yields Si02 43.17, zr02 29.51, 6.80(80)(200); 4.296(60)(310); 3.0l5(100b)(420,32l); 2.747(70) Na20 7.42, K20 11.28, H20 8.63, sum 100.01 %, corresponding (411); 2.673(60)(510); 2.478(60)(002); 2.388(70)(431,501); to empirical formula NaI.02Ko.96(ZrO.99 Tio.0,Feo.0,)Si3.0,09' 2.14H20 2.281(60)(600). The mineral is uniaxial positive, w = 1.598, E= and ideal formula NaKZrSi309'2H20. 1.711, with specific gravity 3.0m... and 3.22oale'The type specimen X-ray analysis shows the mineral to be orthorhombic, space of caratiite is preserved at the British Museum (Natural History) group P2,nb, a = 11.836(4), b = 12.940(6), c = 6.735(4) A, Z = as specimen number BM 1983,74. J.A.Z. 4, Doale2.689, Dmea.2.70(2) glcm3. The strongest XRD lines (28 given) are [d in A(I)(hkl)] 6.46(73)(020), 5.95(70)(011), 5.83(32)(200,101), 5.67(52)(120), 3.12(100)(112,140), 2.894 Fredrikssonite* (19)(122), 2.829(22)(212,240,141), 2.201(21)(103,332,511,412), 2.049(19)(061,052). The crystals are colorless to white, up to 1 P. J. Dunn, D. R. Peacor, W. B. Simmons, and D. Newbury (1983) Fredrikssonite, a new member of the pinakiolite series mm long, with conchoidal fracture, but no cleavage. H 5. Georgechaoiteis opticallybiaxialnegative,with a 1.578(1), from LAngban,Sweden, Geologiska Foreningens i Stockholm = (j 1.597(1), 1.606(1), 2 Vmea.= 67°, 2 Voale= 68°, X a, Forhandlingar, 105, pt. 4, 335-340. = l' = = Y = b, Z = c. Fredrikssonite (ideal composition Mg2Mn3+(B03)02) has been The mineral occurs in association with microcline, nepheline, found on the dumps of the LAngban Mine, Varmland, Sweden. analcime, aegirine, chlorite, catapleiite, and monazite in mia- Microprobe analysis yielded Al203 1.9, Fe203 5.4, Mn203 35.5, rolitic cavities in a nepheline syenite at Wind Mountain, Otero MgO 40.3%, ion microprobe gave an estimated B203 of 17.9%; County, New Mexico. It is named for Professor George Y. Chao sum 101.0%. This gives the formula MgI.93(Mn3+ 0.87Fe3+0.13Alo.07)- of Carleton University, Ottawa, Canada. Type material has been (B03)0.9902.0'(based on a total of three cations). deposited in the National Museum of Natural History, Smith- Powder and single-crystal X-ray diffraction show the mineral sonian Institution. to be orthorhombic, space group Pbam or Pba2, a = 9.18(1), Georgechaoite is isostructural with gaidonnayite, Na2ZrSi309, b = 12.555(6), c = 2.954(2) A, Z = 4, Doale= 3.80, Dm... = 3.84(5) 2H20. Its crystal structure has been refined to a residual R = glcm3. The strongest X-ray lines (36 given) are 5.16(80)(120), 0.053, based on 1840 reflections measured on an automatic sin- 2.590(100)(240), 2.486(90)(201), 2.201(30)(250), 2.013(50)(321, gle-crystal X-ray diffractometer. It consists of sinusoidal single 430),1.570(30)(080,441),1.513(40)(521,171). The mineral is silicate chains, with six-tetrahedron repeat, running parallel to the fourth polymorph with this composition; the others are pi- [101] and [101] directions, which are cross-linked by regular nakiolite, orthopinakiolite, and takeuchiite. [Zr06] octahedra and highly distorted [Na04(H20)2] and The mineral has been found in two assemblages. In one sample [K04(H20)2] octahedra. J.A.Z. it was associated with calcite, adelite, brucite, and hausmannite; in another sample it was found with clinohumite, calcite, and jacobsite. Fredrikssonite is reddish brown and slightly transpar- Grischunite* ent with vitreous luster, it is nearly opaque in one direction. The S. Graeser, H. Schwander, and B. Suhner (1984) Grischunite hardness is about 6 (Mohs). Small fragments show a poor cleavage (CaMn2[As04]2), a new mineral species from the Swiss Alps. and a second very poor cleavage. It is biaxial, positive, with a = Schweiz. Mineral. Petrogr., 64, 1-10 (in German with English 1.82(2), (j 1.99; strongly pleochroic with X = < 1.86, and l' - abstract). golden brown and Z = dark reddish brown to black; absorption Z > X; dispersion strong, r > v; Z = c, Grischunite (ideal composition (Ca,Na)(Mn2+,Fe3+h(As04)2) The name is in honor of Dr. Kurt A. Fredriksson of the Smith- has been found in manganese deposits near Fa10tta, Oberhalb- stein, in the Canton Grisons in eastern Switzerland. Microprobe Minerals marked with asterisks were approved before pub- analysis yielded Na20 1.80, CaO 8.83, Fe203 5.39, MnO 27.23, * lication by the Commission on New Minerals and Mineral Names As20, 54.84; sum 98.09%. The low sum may be due to light of the International Mineralogical Association. elements or water not detected by microprobe. The infrared spec- 0003-004X/86/0 102-0227$02,00 227 -_. - --- 228 NEW MINERAL NAMES trum gave typical arsenate absorptions at 850 and 777 cm-I and 39.8; 495, 42.0, 40.4; 546, 44.1, 43.0; 590, 46.2, 44.9; 624, 47.6, only weak bands thought to be due to adsorbed water at 3420 44.7; 644, 45.3, 44.2; 657, 45.9, 45.3. and 1630 cm-I. Both gupeiite and xifengite occur as cores of spheres 0.1-0.5 Powder and single-crystal X-ray diffraction show the mineral mm in diameter in placers in the Yanshan area, People's Republic to crystallize in the orthorhombic space group Pcab, a = 12.913(6), of China. The spheres are composed of an outer shell of mag- b = 13.48(1) and c = 12.076(6) A, Z = 12, DoalC= 3.99, Dm... = netite, wuestite, and maghemite, an inner shell of kamacite and 3.8(2) g/cm3. The strongest X-ray lines (22 given) are taenite, and a core of either gupeiite or xifengite. Hongquiite 3.617(70)(320,032), 3.150(90)(141,232), 3.015(80)(004), 2.943 (originally reported as TiO, Am. Min., 61,184-185,1976, but (60)(042,014),2.839(100)(421,402). new data gave TiC) is often found in cores with gupeiite. The The mineral is found with brandtite, sarkinite, Mn-berzeliite, surfacecharacteristicsand the minerals present indicate the spheres tilasite, and various other manganese- and arsenic-rich minerals. to be extraterrestrial in origin. The names are for the eastern It is formed by alteration of sarkinite, with which it is often passageways, Gupeikou and Xifengkou, of the Great Wall. Type intergrown. It occurs as dark red-brown crystals (up to I mm), materials are preserved at the Institute of Geology, Chinese Acad- anhedral grains, and lathlike crystals (elongated along b). The emy of Geological Sciences, Beijing. G.Y.C. Vickers hardness is 450-550 kp/mm2 (about 5 Mohs). The cleav- age is perfect along (010), the luster is vitreous, and the streak is yellow red to yellow brown (lighter than the mineral). 2 V is Inaglyite* approximately +40-50°. The indices of refraction are a = 1.784, N. S. Rudashevskii, A. G. Mochalov, V. D. Begizov, Yu. P. (:3 1.785, "y = 1.790 (all :to.003). It is pleochroic with X = = Men'shikov, and N. I. Shumskaya (1984) Inaglyite, Pb- yellow green (XIIb), Y yellow brown (YIIa), and Z dark red = = CulIr,Pt),SI.' a new mineral. Zapiski Vses. Mineralog. Obshch., brown (Zllc); absorption Z Y » X; dispersion R ~ v. R.H.L. "" 113, 712-717 (in Russian). Seven electron microprobe analyses gave Ir 38.7-50.5, Pt 11.5- 21.1, Rh 0-2.54, Pb 8.39-9.15, Cu 6.69-7.36, Ni 0-0.08, S 19.7- Gupeiite, * Xifengite* 21.4, sum 98.23-100.5, corresponding to PbCu.(Ir,Pt),SI.' with Yu Zuxiang (1984) Two new minerals gupeiite and xifengite in Pb 1.00-1.12, (Cu 2.65-2.87, Fe 0.12-0.52, Ni 0-0.03), (Ir 5.00- cosmic dusts from Yanshan. Acta Petrologica Mineralogica et 6.32, Pt 1.38-2.66, Rh 0-0.63), S 15.58-16.18. Analytica, 3, 231-238 (in Chinese with English abstract). X-ray data showed the mineral to be hexagonal, space group P6/m, P6, P6/mmm, P622, or P62m, a = 7.03:t0.01, c = Gupeiite 16.44:t0.01 A.
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