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New Mineral Names* American Mineralogist, Volume 84, pages 193±198, 1999 NEW MINERAL NAMES* JOHN L. JAMBOR1 AND ANDREW C. ROBERTS2 1Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada 2Geological Survey of Canada, 601 Booth Street, Ottawa K1A 0E8, Canada Arnhemite, pyrophosphite Arnhem Cave, 150 km east of Windhoek, Namibia. As- J.E.J. Martini (1994) Two new minerals originated from sociated minerals are minor archerite, small grains of bat guano combustion in Arnhem Cave, Namibia. Bull. quartz and cristobalite, and fragments of carbon. The slag South African Speleological Assoc., 33, 66±69. is interpreted to have resulted from the melting of ashes during the combustion of bat guano. Arnhemite formed Arnhemite subsequently by secondary hydration of an unknown pre- Occurs as ¯akes, up to 50 mm, that form aggregates cursor (see abstract for pyrocoproite). Arnhemite and pyr- making up the principal component of a thin layer of ophosphite are in the Transvaal Museum, Pretoria, South white, friable slag in a pro®le of cave-¯oor soil. White Africa. color, pearly luster, soft, perfect {001} cleavage, D 5 meas Discussion. Although data for arnhemite and pyro- 2.35, D 5 2.33 g/cm3 for Z 5 4. Insoluble in water, calc phosphite were submitted to the CNMMN prior to pub- readily soluble in HCl. Optically uniaxial negative, v5 lication of the paper, neither proposal was approved. 1.516, e51.503. The average and range of 12 electron J.L.J. microprobe analyses (H2O by gas chromatography) gave Na2O 4.48 (3.84±5.57), K2O 20.92 (17.50±22.03), MgO 11.31 (10.27±12.25), CaO 1.30 (0.88±2.46), MnO 0.28 (0.20±0.33), FeO 0.38 (0.07±0.67), ZnO 0.18 (0.08± Djer®sherite-thalfenisite analogs 0.41), P2O5 45.61 (43.95±46.94), H2O 14.70, sum 99.16 wt%, corresponding to (K Na ) (Mg Ca Fe A.Y. Barkov, K.V.O. Laajoki, S.A. GehoÈr, Y.N. Yakovlev, 2.78 0.91 S3.69 1.76 0.15 0.03 O. Taikina-Aho (1997) Chlorine-poor analogues of Mn Zn ) P O ´5.11H O for O 5 19, ideally 0.02 0.01 S1.97 4.03 13.89 2 djer®sherite-thalfenisite from Noril'sk, Siberia and Sal- (K,Na) Mg (P O ) ´5H O. The X-ray powder pattern con- 4 2 2 7 2 2 magorsky, Kola Peninsula, Russia. Can. Mineral., 35, sists of seven lines: 16.7(100,001), 8.33(15,011), 4.616 1421±1430. (5,112), 3.184(5,030), 2.761(25,220), 2.300 (10,224,042), and 2.216(5,126); indexing is based on a possible hex- Electron microprobe analyses of djer®sherite, ideally agonal cell with a 5 11.06, c 5 16.75 AÊ . The new name K (Fe,Cu,Ni) S Cl, showed that the Cl formula contents is for the locality (see below). 6 25 26 ranged from 1.03 to 0.02. A representative analysis of the Pyrophosphite three listed for the Cl-poor mineral gave K 7.70, Fe Twelve electron microprobe analyses gave an average 35.71, Ni 2.37, Cu 18.63, S 33.60, Cl 0.03, sum 98.04 wt%, corresponding to K5.15(Fe16.72Cu7.67Ni1.06)S25.45S27.39Cl0.02. of Na2O 1.02, K2O 29.10, MgO 0.87, CaO 19.11, MnO The mineral, which seems to be a S-substituted analog of 0.07, FeO 0.07, ZnO 0.05, P2O5 49.15, sum 99.44 wt%, djer®sherite, occurs as inclusions 10±20 mm across with- corresponding to (K1.79Na0.10)S1.89(Ca0.99Mg0.06)S1.05P2.00O7.00, ideally K2CaP2O7. Occurs as anhedral, ovoid grains, up to in djer®sherite that forms part of the sul®de-rich core of 50 mm across, in a matrix of arnhemite and archerite. the Salmagorsky alkaline ultrama®c complex, Kola Pen- White color, vitreous luster, soft, no cleavage observed, insula, northwestern Russia. 3 Dmeas 5 2.75, Dcalc 5 2.76 g/cm for Z 5 4. Insoluble in Electron microprobe analyses of a Cl-poor analog of water, readily soluble in HCl. Optically biaxial, a5 thalfenisite, the latter ideally Tl6(Fe,Ni,Cu)25S26Cl, gave K 1.543, g51.549. By analogy with the synthetic analog, 2.2, Tl 23.8, Pb 4.6, Fe 30.5, Ni 8.8, Cu 4.1, S 25.9, Cl monoclinic symmetry, space group P21/n; indexing of the not detected, sum 99.9 wt%, corresponding to (Tl3.83K1.85 X-ray powder pattern (diffractometer, CoKa radiation) Pb0.73)S6.41(Fe17.96Ni4.93Cu2.12)S25.01S26.57, which is the Cl-free gave a 5 9.742, b 5 5.653, c 5 12.955 AÊ , b5104.358. analog of thalfenisite. Eight other listed analyses show Strongest lines are 4.32(32,202), 3.137(33,004), extensive K-Tl substitution and maximum formula Cl 5 2.987(64,113), and 2.821(100,311). 0.13, suggesting complete solid solution between the Cl- Arnhemite and pyrophosphite are the principal phases poor analogs of thalfenisite and djer®sherite. These occur in a slag that forms a thin layer in a pro®le of soil at as subhedral to euhedral grains, typically triangular in cross-section and 5±30 mm across, enclosed within chal- * Before publication, minerals marked with an asterisk were approved by the Commission on New Minerals and Mineral copyrite at the Oktyabrsky deposit, which is part of the Names, International Mineralogical Association. Noril'sk complex, Siberia, Russia. J.L.J. 0003±004X/99/0102±0193$05.00 193 194 JAMBOR AND ROBERTS: NEW MINERAL NAMES Gwihabaite* The mineral occurs with cinnabar and corderoite, the J.E.J. Martini (1996) GwihabaiteÐ(NH4,K)NO3, ortho- latter the cubic polymorph of kenhsuite, as dispersed rhombic, a new mineral from Gcwihaba Cave, Bot- grains in montmorillonite, and as crystals and aggregates swana. Bull. South African Speleological Assoc., 36, on fracture surfaces and in cavities, at the open pit of the 19±21. inactive McDermitt Hg deposit near McDermitt, north- Gas chromatography and X-ray ¯uorescence analysis central Nevada. The new name is for Kenneth Hsu (b. gave (NH ) O 25.09, K O 10.40, N O 61.44, sum 98.90 1929) of the Swiss Federal Institute of Technology, Zu- 4 2 2 2 5 rich. Representative samples are in the Smithsonian In- wt%, corresponding to [(NH4)0.81K0.19]S1.00(NO3)1.00. The mineral occurs as saline crusts on boulders, and as slender stitution, Washington, and in the W.M. Keck Museum of needles and oulopholites, up to 5 mm long, that form the Mackay School of Mines, Reno, Nevada. J.L.J. ef¯orescences on the wall and earthy ¯oor of a bat-in- habited cave in a dolomite hill in the Kalahari basin, 280 km west of Maun. Colorless, vitreous luster, transparent, Kentbrooksite* H 5;2, no cleavage; crystals are acicular [001], show- O. Johnsen, J.D. Grice, R.A. Gault (1997) Kentbrooksite ing {110}, {100}, and {111}. Highly soluble in water, from the Kangerdlugssuaq intrusion, East Greenland, a deliquescent in a humid atmosphere, D 5 1.77, D 5 new Mn-REE-Nb-F end-member in a series within the meas calc eudialyte group: Description and crystal structure. Eur. 1.79 g/cm3 for Z 4. Optically colorless, biaxial nega- 5 J. Mineral., 10, 207±219. tive, a51.458, b51.527, g51.599, 2Vmeas 5 908,2Vcalc 5 878, no detectable dispersion. Orientation, X 5 b, Y 5 The mineral occurs as anhedral to subhedral aggregates a, Z 5 c. Single-crystal X-ray study indicated orthorhom- up to 2 cm. Electron microprobe analysis gave SiO2 bic symmetry, space group Pbnm, a 5 7.075, b 5 7.647, 45.34, ZrO 11.08, Na O 14.51, CaO 5.62, FeO 1.58, Ê 2 2 c 5 5.779 A. Strongest lines of the powder pattern are MnO 8.01, K2O 0.43, La2O3 2.23, Ce2O3 2.44, Nd2O3 0.69, 3.863(75,111), 3.364(85,120), 3.212(95,210), 3.194(100, Y2O3 1.46, Nb2O5 2.26, Al2O3 0.21, SrO 0.49, TiO2 0.56, 021), and 2.595(90,220). HfO2 0.36, MgO 0.06, Cl 0.29, F 0.88, H2O by CHN 1.28, The mineral, which is derived through the bacterial de- O [ Cl 1 F 0.44, sum 99.34 wt%, corresponding to cay of bat guano, is associated with gypsum, syngenite, (Na14.93REE0.44Y0.42K0.30Sr0.15)S16.24 (Ca3.27Mn1.78REE0.62Na0.33)S6.00 boussingaultite, and dittmarite. The new name is for the (Mn1.90 Fe0.72 Al0.13 Mg0.05)S2.80 (Nb0.55 Zr0.12Ti0.10)S0.77Si0.60 (Zr2.81 locality, Gcwihaba Cave, but has been slightly modi®ed Hf0.06Ti0.13)S3[(Si3O9)2(Si9O27)2O2](F1.51Cl0.27OH0.22)S2´2.3H2O, to aid pronunciation. Type material is in the Transvaal simpli®ed as (Na,REE)15(Ca, REE)6Mn3Zr3NbSi25O74F2 Museum, Pretoria, South Africa. J.L.J. ´2H2O. Yellow-brown color, vitreous luster, transparent, white streak, brittle, uneven fracture, no cleavage, H 5 5±6, non¯uorescent, strongly pyroelectric, Dmeas 5 3 Kenhsuite* 3.10(4), Dcalc 5 3.08 g/cm for Z 5 3. Optically uniaxial J.K. McCormack, F.W. Dickson (1998) Kenhsuite, g- negative, nonpleochroic, v51.628(2), e51.623(2). Sin- Hg3S2Cl2, a new mineral species from the McDermitt gle-crystal X-ray structure study (R 5 0.041) indicated mercury deposit, Humboldt County, Nevada.
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