American Mineralogist, Volume 79, pages 185-189, 1994 NEW MINERAL NAMES* JonN L. Ja.rvnon Department of Earth Sciences,University of Waterloo, Waterloo, Ontario N2L 3Gl, Canada EowlRD S. Gnnw Department of Geological Sciences,University of Maine, Orono, Maine 04469, U.S.A. Gatehouseite* Wet-chemicalanalyses gave MgO 5.29, 8.5 2, MnO 8.02, A. Pring, W.D. Birch (1993) Gatehouseite,a new man- 0.92,MnO, 67.65,68.49,CaO1.97,2.03, SiO, 1.20,3.94, ganesehydroxy phosphate from Iron Monarch, South Al,O,0.78,0.91,PrO,0.59, 1.63, Fe,Or 0.52, 1.41, H2O+ Australia.Mineral. Mag., 57, 309-313. 13.37, 12.60,sum 99.39, 100.45wt0/0, corresponding to (Mgo'Mno ooCaoor)r, orMnjfi 30 ^o' 2.90H2O and (Mgorr- Electron microprobe analysis gave MnO 64.42, FeO Mnoor)"o roMn 1150? r0.2.80HrO, ideally (Mg,Mn)Mni*- 0.19,CuO 0.03,ZnO 0.03,PbO 0.05,AlrO3 PrO, 0.10, O?.3HrO. Occursas soft, porousaggregates and massive 22.18,V2Os 0.38, As,O, 3.58,HrO..," 6.44, sum 97.40 ore in which individual grains are up to I x 5 rrm. Color wto/0,corresponding to Mn,onFeoo,Al0o,(P, rrAso,r- brown to brownishblack, opaqus,D*."" : 3.60(l) g/cm3, Voor)", ideally Mnr(POo)r(OH)o. roo8(OH)ooo, Occurs as D"",. : 3.598 g/cml for Z : 2. Grayish white in reflected pale yellow, and yellow to pale brownish orangeradiating light, distinct anisotropism, brown internal reflection. to divergent bladed 100 pm crystals up to long; individ- Reflectanceswere measuredon a compressedpellet; mean ualsare elongate showingmainly 102}, I l0}, [010], { { and valuesin air (SiC standard)are 23.0 (470 nm), 19.9(546 Adamantine luster, transparent,pale yellow {001}. streak, nm), l9.l (589nm), and 18.6(650 nm). The DTA pattern H : 4, splintery fracture, distinct cleavage,some {010} has strong endothermic reactionsat 230 and 635 "C, the grains twinned on D*r" : for {001}, 3.14 the empirical former correspondingto HrO loss, and the latter to Mn formula, 3.85 g/cm3 for the ideal formula witt. : Z 4. oxidation and changeof structure.The X-ray powder pat- Optically biaxial, sign uncertain, length parallel slow, ex- tern is like that ofchalcophanite, which by analogy and tinction, refractiveindices in two directions,1.74(l) and Rietveld refinement gave triclinic symmetry, spacegroup 1.76(l), distinctly pleochroicfrom brown to nearly col- PI, a:7.534(4), b:7.525(6), c:8.204(8) A, a: orless. TEM patterns and analogy with synthetic 89.753(8),P : 117.375(6),t : 120.000(6)'.Strongest Mn,(POo)r(OH)oindicate that mineral the is orthorhom- lines of the powder pattern are 6.965(100,00l), bic, spacegroup P2,2,2,; a: 9.097(2), : b: 5.693(2),c 5.539(8,100,111), 4.086(8,01l,l02,l I l, 3.483(lr,002), 18.002(10)A as refined from the powder pattern (100- 2.449(7,312,t 21 .230), and 2.230(23,I 20.3T3,23 I ). The mm Guinier-Higg, radiation) CrKa, with strongestlines infrared spectrum is similar to that of chalcophanite. of 2.900(100,1l5), 2.853(70,106), 2.802(50,021), The new mineral is a hypogenephase associated with 2.702(80,303), 2.022(1 I 5,322),and .608( I 5,3 3 0). various hydrated manganeseoxide samplesin manganese The mineral, which also occurs as overgrowths on ar- ore near Lu village, Jianshui County, Yunnan Province, senoclasite,is the P analogue of arsenoclasite.The new China. The name is derived from the locality. Type ma- name is for Bryan M.K.C. Gatehouse(b. 1932), crystal terial is in the Museum of Geology, Beijing, and in the chemistat Monash Melbourne, University, Australia. The GeologyExhibit Museum,Yunnan. J.L.J. mineral was found in cavities in a matrix of hematite, hausmannite,barite, and carbonatesat the Iron Monarch Precambrian sedimentaryiron ore deposit, northern end Manganosegelerite* of the Middleback Ranges,South Australia. Type mate- rial is in the South Australian Museum at Adelaide and A.V. Voloshin, Ya.A. Pakhomovskiy, F.N. Tyusheva in the Museum of Victoria, Melbourne. J.L.J. (l 99 2) Manganosegelerite(Mn,Ca)(Mn,Fe,Mg)Fe3* (PO.)r(OH).4HrO: A new phosphateof the overite group from granitic pegmatitesof the Kola Peninsula. Jianshuiite* Zapiski Vses.Mineral. Obshch.,l2l(2),95-103 (in Russian). Guiyan Yan, ShanghuaZhang, Mingkai Zhao, Jianping Ding, Deyu Li (1992) Jianshuiite:A new magnesium Electron microprobe analysesof three grainsgave MnO mineral of the chalcophanitegroup. Acta Mineral. Sin- 16.20,15.36, 16.37, CaO 5.33, 5.04, 5.14,MgO 2.60, ica,l2(l),69-77 (in Chinese,English abs.). 2.93,2.83,Fe as Fe,O, 24.04,18.31,22.61, A1rO30,6.34, 1.48,P2O5, 33.04, 35.03, 33.2l,I{rO (bydifference) 18.79, *Before publication, minerals marked with an asterisk were 16.99,18.36, sum 100wto/0. The third analysis,after nor- approved by the Commission on New Minerals and Mineral malizalion to 2P and I (Fe:* + Al) and adjustment of Names, International Mineralogical Association. the Fe2+/Fe3+ratio to fit the stoichiometry, corresponds ooo3404x/ 94/0 I 02-o I 85$02.00 185 r86 JAMBOR AND GREW: NEW MINERAL NAMES to (Mnou,Cao.rn)r,.oo(Mno 38FefrjrMgo ro)", o,(FedirAlo ,r)- 104.90(2f. Strongestlines ofthe powder pattern [report- ,, 00(POn),(OH).4.04HrO, ideally(Mn,Ca)(Mn,Fe'z*, ed fully only in Della Ventura et a1.,Periodico Miner- Mg)Fe3+(PO.)r(OH). 4HrO. The infraredspectrum is al. (52, 617-630)l are8.49(95,1 l0), 3.288(80,240), characterizedby features characteristic of both OH and 3.166(100,310),2.831(60,330), 1.918(20,510), and HrO; the strongestabsorption bands (15 reported) are at r.633(t5,62r). 3440,1660,I 150, I 100, 1050,600, and 475 cm '. Oc- The new mineral is associatedwith calcite and diopside curs as fine-grainedaggregates (to 2 mm across)ofpoorly in a skarn ejectum occurring in pyroclastsnear San Vito, developed prismatic individuals up to 0.05 mm across. Monte Somma, Naples, Italy. Known also as a synthetic Yellow or yellow-greencolor, yellow streak,vitreous lus- phase. Type material is in the Museo di Mineralogia, ter, H : 3-4, transparentin thin grains,imperfect {001} University of Rome, Rome, Italy. J.L.J. cleavage.D-..": 2.76(3)by heavyliquids, D.,.:2.74 g/cm3for Z : 8. Opticallybiaxial positive,a: 1.657(l), Stibiocolusite* P : 1.668(l),t : 1.691(2),2V*"^,: 75(5),2V^,. : 70; (1992) marked dispersion, r < v; orientation ,y : Y, P : X, ot: E.M. Spiridonov, A.S. Badalov, V.V. Kovachev StibiocolusiteCuruVr(Sb,Sn,As)uSrr: A new mineral. Z, pleochroism a : yellow, 7 : light yellow. Single-crys- Akad. Nauk, 324(2),411-414 (in Russian). tal studies were not possible. By analogy with the iso- Doklady structural minerals oliverite and segelerite,the symme- Four electron microprobe analysesof specimensfrom tery is inferred to be orthorhombic, spacegroup Pbca, a Kayragach (first three values) and Chelopech gave Cu : 14.89(l),r: 18.79(l),c:7.408(fi A from powder 48.53,49.32, 49.05, 46.7 4, Fe 0.90,0.92, 0.87, 1.68, Mn data (ll4-mm camera,Fe radiation). Strongestlines in 0.04,0.02,0.06,0.10, Co 0.01,0.01, 0, 0, Ag 0.01,0, the pattern (37 given) are 9.39(100,020),4.70(50,040), 0.01,0.03, v 3.18,3.24, 2.96,3.02, Sb 8.27 ,7 .83,1.91, 2.97 (40,302), 2.86(90,1 42), 2.60(40,4 | 2,r 52), 2.0| 9- 9.87,As 3.87,3.69,3.83,3.35, Sn 6.80,5.47, 6.68, 5.23, (40,622),1.966(50,182), and 1.880(50,661,0.10.0). Ge 0.14,0.15,0.08,0.37,Mo 0.53,0.52,0.51,trace, S Occurson accumulationsof mitridatite in late fractures 29.73,29.65, 29.20, 30.06,sum 102.01, 100.82, l0l.l6, in granitic pegmatitesof the Kola Peninsula,Russia; also 100.45 wtol0. The Kayragach analyses correspond to locally developed from lunjokite, replacing it in pseudo- CuruVr(Sbr'Sn,noAs,,r)"uSrr, and both fit Cu2uV2- morphs. Other associatedminerals are eosphorite,kings- (Sb,Sn,As)uSrr.Reflectance values (Si standard, air) are mountite, and manganoan gordonite. The new name is given in 20-nm intervals from 400 to 700 nm; represen- for the Mn analogueof segelerite.Samples have been de- tativevalues are 400 22.5,44023.8, 480 25.5,520 27.1, posited in the Fersman Mineralogical Museum, Moscow. 58029.5, 600 30.1, 640 31.0, 700 31.1. The mineralforms E.S.G. oval segregations5-15 (rarely 80) pm acrossin tetrahe- drite (Kayragach)and rounded grains up to 40 pm across in enargite and luzonite. Dark glay color, gray streak, Potassium-fluor-richterite* metallic luster, VHN, o : 273 (range 260-285), no cleav- G. Della Ventura, G.C. Parodi, A. Maras (1992) Potas- age, conchoidal fracture, D*r. : 4.66 g/crn3 for Z : I sium-fluor-richterite, a new amphibole from San Vito, (Kayragach).In reflectedlight, light gray with light brown Monte Somma,Compania, Italy. Rendiconti Lincei, Sci. or rose-brown tint.