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New Minerals Recently Approved by the Commission on New Minerals and Mineral Names, International Mineralogical Association

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New Minerals Recently Approved by the Commission on New Minerals and Mineral Names, International Mineralogical Association New minerals recently approved by the Commission on New Minerals and Mineral Names, International Mineralogical Association Objekttyp: Group Zeitschrift: Schweizerische mineralogische und petrographische Mitteilungen = Bulletin suisse de minéralogie et pétrographie Band (Jahr): 71 (1991) Heft 3 PDF erstellt am: 01.10.2021 Nutzungsbedingungen Die ETH-Bibliothek ist Anbieterin der digitalisierten Zeitschriften. Sie besitzt keine Urheberrechte an den Inhalten der Zeitschriften. Die Rechte liegen in der Regel bei den Herausgebern. Die auf der Plattform e-periodica veröffentlichten Dokumente stehen für nicht-kommerzielle Zwecke in Lehre und Forschung sowie für die private Nutzung frei zur Verfügung. Einzelne Dateien oder Ausdrucke aus diesem Angebot können zusammen mit diesen Nutzungsbedingungen und den korrekten Herkunftsbezeichnungen weitergegeben werden. Das Veröffentlichen von Bildern in Print- und Online-Publikationen ist nur mit vorheriger Genehmigung der Rechteinhaber erlaubt. Die systematische Speicherung von Teilen des elektronischen Angebots auf anderen Servern bedarf ebenfalls des schriftlichen Einverständnisses der Rechteinhaber. Haftungsausschluss Alle Angaben erfolgen ohne Gewähr für Vollständigkeit oder Richtigkeit. Es wird keine Haftung übernommen für Schäden durch die Verwendung von Informationen aus diesem Online-Angebot oder durch das Fehlen von Informationen. Dies gilt auch für Inhalte Dritter, die über dieses Angebot zugänglich sind. Ein Dienst der ETH-Bibliothek ETH Zürich, Rämistrasse 101, 8092 Zürich, Schweiz, www.library.ethz.ch http://www.e-periodica.ch SCHWEIZ. MINERAL. PETROGR. MITT. 71, 467-472, 1991 New minerals recently approved by the Commission on New Minerals and Mineral Names International Mineralogical Association The information given here is provided by the Commission on New Minerals and Mineral Names, I. M. A. for comparative purposes and as a service to mineralogists working on new species. It is hoped that future lists will be published in the major mineralogical journals on a quarterly or semi-annual basis. Each mineral is described in the following format: IMA No. (any relationship to other minerals) Chemical Formula Crystal system, space group unit cell parameters Diaphaneity; lustre; colour Optical properties Strongest lines in the X-ray powder diffraction pattern The names of these approved species are considered confidential information until the authors have published their descriptions or released information themselves. No other information will be released by the commission J.A. Mandarino, Chairman Commission on New Minerals and Mineral Names International Mineralogical Association The following minerals were approved during 1990 IMA No. 90-002 Transparent; vitreous; pale yellow brown in (Ce,La)Al2B309 thin-section. Hexagonal, P62m Biaxial (+), a 1.735, ß 1.741, y 1.758,2V(meas.) a 4.610, c 9.358 À 64°, 2V(calc.) 62°. Transparent to translucent; vitreous; light 9.1(40), 3.50(50), 2.910(90), 2.842(50), yellow. 2.698(100), 2.622(60), 2.177(40), 2.137(40). Uniaxial (+), id 1.703, e 1.711 3.67(100), 3.04(100), 2.458(75), 2.308(50), IMA No. 90-005 2.020(50), 1.953(50), 1.855(50), 1.835(50) Ca5Si6(0,0H)18- 5 H20 Monoclinic, Cc or C2/c a 11.331, b 7.353, c 22.67 Ä, ß 96.59° IMA No. 90-004 Transparent; vitreous; colourless to white. the Mg-dominant analogue of allanite-(Ce) Biaxial (-), a 1.575, ß 1.580, y 1.585, 2V(calc.) Ca(Ce,La)MgAl2Si3012(0H) 89.8°. Monoclinic, P2,/m 11.25(100), 3.745(36), 3.304(51), 3.068(45), a 8.916, b 5.700, c 10.140 Â, ß 114.72° 3.034(60), 3.012(37), 2.811(41), 2.794(60). 468 IMA/CNMMN IMA No. 90-007 Transparent; vitreous; colourless. the Cu-dominant analogue of braunite and nelt- Uniaxial (-), w 1.508, e 1.506. nerite 6.39(S), 4.77(vS), 3.69(m), 3.27(vS), 2.769(m), Cu2+Mn|+(08/Si04) 2.650(m). Tetragonal, 14,/acd a 9.409, c 18.600 À IMA No. 90-013 Opaque; metallic; black. Na7[Al5Si7024]C03 • 3 H20 In reflected light: grey, very weak anisotropism, Hexagonal, P63mc weak bireflectance, nonpleochroic. R-values: a 12.575, c 5.105 À (20.8, 21.2%) 470 nm, (19.6, 20.0%) 546 nm, Transparent; vitreous; dark- to light-lilac. (19.2,19.7%) 589 nm, (18.7,19.2%) 650 nm. Uniaxial (-), « 1.509, e 1.490. 2.703(100), 2.352(14), 2.135(16), 1.6516(30), 6.30(70), 4.61(50), 3.65(90), 3.22(100), 1.4167(10), 1.4023(12). 2.722(50), 2.597(20), 2.402(20), 2.097(20). IMA No. 90-008 IMA No. 90-014 Ca(Na,K)7(Si6Al6024)(S_2)15 • H20 Na8[Al6Si6024](0H)2 • 2 H20 Hexagonal (trigonal), P31c Hexagonal, P63 a 12.855, c 10.700 À a 12.74, c 5.183 À Transparent; vitreous; yellow. Transparent; vitreous; light blue or colourless. Uniaxial (-), to 1.584, e 1.660 Uniaxial (+), w 1.494, e 1.501. 4.824(70), 3.919(80), 3.720(100), 3.313(90), 6.43(25), 4.70(60), 3.68(70), 3.26(100), 2.694(35), 2.676(70), 2.471(35). 2.756(50), 2.433(30). IMA No. 90-009 IMA No. 90-015 (Na,Ca,K)s(Si6Al6024)(S04)2Cl • 0.5 H20 Na3(Y,REE)(C03)3 • 3 H20 Hexagonal, P6Z22 Orthorhombic, space group unknown, lattice is a 12.843, c 32.239 Â primitive Transparent; vitreous; green to greenish-yellow. a 10.136, b 17.348, c 5.970 À Uniaxial (+), o> 1.528, e 1.543 Transparent; vitreous to dull; colourless. 4.84(40), 3.711(100), 3.314(80), 3.035(20), Biaxial (+), a 1.528, ß 1.529, y 1.531,2V(meas.) 2.988(16), 2.687(25), 2.470(16), 2.139(25). 45°, 2V(calc.) 71°. 6.53(55), 5.05(50), 4.85(65), 2.858(70), IMA No. 90-010 2.597(50), 2.229(50), 2.076(100). Fe8_2x[(As1_x,Sx)04]6(0H)6 • 5 H20, x is about 0.2 Orthorhombic, Pbcm IMA No. 90-016 a 6.412, b 19.45, c 8.941 Â an orthorhombic polymorph of natisite Transparent to translucent; greasy; cadmium Na2TiSi05 orange. Orthorhombic, Pmma Biaxial (-), a 1.94, ß 2.05, y 2.06, 2V(meas.) 5°, a 9.827, b 9.167, c 4.799 Â 2V(calc.) 32°. Translucent; adamantine; yellow, orange- 9.75(10), 4.476(4), 3.208(9), 3.047(5), 2.680(4), yellow, orange-brown. 2.153(4), 1.604(4). Biaxial (+), a 1.740, ß 1.741, y 1.765, 2V(meas.) 20°, 2V(calc.) 23°. IMA No. 90-011 2.748(100), 2.257(25), 1.720(30), 1.680(30), HgAg(Cl,Br,I)S 1.475(33), 1.443(35). Orthorhombic, P2Ä2 a 6.803, b 12.87, c 4.528 Â IMA No. 90-018 Translucent to opaque; subadamantine to a regular 1:1 interstratification of cookeite and submetallic; black. paragonite Biaxial (probably -), a ~ 2.2, y ~ 2.3. Lio.5Na05Al3Si3A1010(OH)5 6.43(40), 3.762(60), 3.637(60), 3.283(30), Monoclinic, C2/m 2.664(100), 2.265(40), 2.047(20). a 5.158, b 8.914, c 23.83 Â, ß 94.23° Transparent; pearly; white. IMA No. 90-012 Biaxial (-), a 1.58 « 1.59, ß 1.58 « 1.59, y 1.59 Na6K2(Si6Al6024)(S04) • 2 H20 « 1.60,2V(meas.) 30-50°. Hexagonal, P63 11.89(70), 4.456(90), 4.325(90), 2.547(100), a 22.121, c 5.221 Â 2.476(70), 1.486(90). NEW MINERALS APPROVED DURING 1990 469 IMA No. 90-019 Biaxial (-), a 1.540, ß 1.551, y 1.557,2V(meas.) the Mg-dominant analogue of chalcophanite 73° 2Vfcalc 1 72° (Mg,Mn,Ca)Mnf07 • 3 H20 6.89(70), 3.45(100), 3.26(90), 3.05(80), Triclinic, PI 2.880(70), 2.715(70), 2.463(70). a 7.534, b 7.525, c 8.204 À, a 89.753°, ß 117.375°, y 120.000° IMA No. 90-025 Opaque; dull; coffee black. Na17Ca3Mg(Ti,Mn)4(Si207)2(P04)603F5 In reflected light: grey, clear anisotropism, Triclinic, PI weak bireflectance, nonpleochroic. R-values: a 5.412, b 7.079, c 26.56 Â, oi 95.21°, ß 93.51°, (23.0%) 470 nm, (19.9%) 546 nm, (19.1%) y 90.10° 589 nm, (18.6%) 650 nm. Translucent to transparent; vitreous to pearly; 6.965(100), 5.539(3), 4.086(4), 3.522(3), light brown. 3.483(11), 2.230(8). Biaxial (-), a 1.600, ß 1.658, y 1.676,2V(meas.) 56°, 2V(calc.) 57°. IMA No. 90-020 2.937(10), 2.702(9), 2.659(8), 2.048(8B), MnS03 • 3 H,0 1.771(5B), 1.730(5). Orthorhombic, Pnma a 9.762, b 5.639, c 9.558 À IMA No. 90-026 Transparent; vitreous; colourless. Na14CaMgTi4(Si207)2(P04)404F2 Biaxial (+), a 1.590, ß 1.596, y 1.636,2V(meas.) Triclinic, PI 41°, 2V(calc.) 43°. a 5.415, b 7.081, c 20.34 Â, a 86.85°, ß 94.40°, 6.83(S), 4.33(VS), 3.43(VS), 2.704(M), y 89.94° 2.666(M), 2.414(M), 1.726(M).IMA Translucent to transparent; vitreous to pearly; light brown. IMA No. 90-021 Biaxial (-), a 1.630, ß 1.678, y 1.697,2V(meas.) the Ti-dominant analogue of lavenite 62°, 2V(calc.) 63°. NaCa(Mn,Fe)(Ti,Nb,Zr)Si2070F 2.880(10), 2.702(8B), 2.636(7), 2.050(5), Monoclinic, P2,/a 1.662(4B), 1.600(5).
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