Eur. J. Mineral. 1991,3,1009-1013 New minerals recently approved by the Commission on New Minerals and Mineral Names International Mineralogical Association JOSEPH A. MANDARINO Department of Mineralogy, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, Canada M5S 2C6 Some time ago the Commission on New Minerals and Mineral Names decided that we could do a distinct service to the mineralogical community if we published very short descriptions of newly approved mineral species without, of course, their names. The purpose of this is to assist mineralo­ gists who are working on new minerals which may be the same as those already approved, but as yet not published, species. The frequency of multiple proposals for the same species is increasing and it is hoped that this service will alert prospective proposers to the existence of these new species and thus save them some time and frustration in coming in second or third with the same mineral. J.A. Mandarino, Chairman of C.N.M.M.N. The information given here is provided by the Commission on New Minerals and Mineral Names, I. M. A. for comparative purposes. 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. 0935-1221/91/0003-1013$ 1.25 65 Eur. J. Mineral. 3 © 1991 E. Schweizerbart'sche Verlagsbuchhandlung, D-7000 Stuttgart 1 1010 J.A. Mandarino THE FOLLOWING MINERALS WERE APPROVED DURING 1990 IMA No. 90-002 Transparent to translucent; greasy; cadmium orange. (Ce,La)Al2B3C>9 Biaxial (-), α 1.94, ß 2.05, η 2.06, 2V(meas.) 5°, Hexagonal, P62m 2V(calc.) 32°. a 4.610, c 9.358 A 9.75(10), 4.476(4), 3.208(9), 3.047(5), 2.680(4), Transparent to translucent; vitreous; light yellow. 2.153(4), 1.604(4). Uniaxial ( + ), ω 1.703, e 1.711 IMA No. 90-011 3.67(100), 3.04(100), 2.458(75), 2.308(50), 2.020(50), HgAg(Cl,Br,I)S 1.953(50), 1.855(50), 1.835(50) Orthorhombic, P2j2t2 IMA No. 90-004 a 6.803, b 12.87, c 4.528 A the Mg-dominant analogue of allanite-(Ce) Translucent to opaque; subadamantine to submetallic; Ca(Ce,La)MgAl2Si3O12(OH) black. Monoclinic, P21/m Biaxial (probably -), a ~ 2.2, 7 - 2.3. a 8.916, b 5.700, c 10.140 A, ß 114.72° 6.43(40), 3.762(60), 3.637(60), 3.283(30), 2.664(100), Transparent; vitreous; pale yellow brown in 2.265(40), 2.047(20). -^ thin-section. IMA No. 90-012 BΓaxial ( + ), α 1.735, ß 1.741, 7 1.758, 2V(meas.) 64°, Na K (Si Al 0 )(S0 ).2H 0 2V(calc.) 62°. 6 2 6 6 24 4 2 Hexagonal, P63 9.1(40), 3.50(50), 2.910(90), 2.842(50), 2.698(100), a 22.121, c 5.221 A 2.622(60), 2.177(40), 2.137(40). Transparent; vitreous; colourless. IMA No. 90-005 Uniaxial (-), ω 1508., e 1506. -<^5Si6(O,OH)18.5H2O 6.39(S), 4.77(vS), 3.69(m), 3.27(vS), 2.769(m), Monoclinic, Cc or C2/c 2.650(m). a 11.331, b 7.353, c 22.67 A, ß 96.59° Transparent; vitreous; colourless to white. IMA No. 90-013 Biaxial (-), a 1.575, ß 1.580, η 1.585, 2V(calc.) 89.8°. Na7[Al5Si7O24]CO3.3H2O 11.25(100), 3.745(36), 3.304(51), 3.068(45), 3.034(60), Hexagonal, P63mc 3.012(37), 2.811(41), 2.794(60). a 12.575, c 5.105 A Transparent; vitreous; dark- to light-lilac. IMA No. 90-007 Uniaxial (-), ω 1.509, e 1.490 the Cu-dominant analogue of braunite and neltnerite 6.30(70), 4.61(50), 3.65(90), 3.22(100), 2.722(50), 2+ 3 + Cu Mn 6 (O8/SiO4) 2.597(20), 2.402(20), 2.097(20). Tetragonal, W^acd a 9.409, c 18.600 Λ IMA No. 90-014 Opaque; metallic; black. Na8[Al6Si6O24](OH)2.2H20 In reflected light: grey, very weak anisotropism, weak Hexagonal, P63 bireflectance, nonpleochroic. R-values: (20.8, a 12.74, c 5.183 Ä 21.2%) 470nm, (19.6, 20.0%) 546nm, (19.2, 19.7%) Transparent; vitreous; light blue or colourless. 589nm, (18.7, 19.2%) 650nm. Uniaxial ( + ), ω 1.494, e 1.501 6.43(25), 4.70(60), 3.68(70), 3.26(100), 2.756(50), 2.703(100), 2.352(14), 2.135(16), 1.6516(30), 1.4167(10), 1.4023(12). 2.433(30). IMA No. 90-008 IMA No. 90-015 2 Na3(Y,REE)(CO3)3.3H20 Ca(Na,K)7(Si6Al6O24)(S- )15.H2O Hexagonal (trigonal), P31c Orthorhombic, space group unknown, lattice is a 12.855, c 10.700 A primitive Transparent; vitreous; yellow. a 10.136, b 17.348, c 5.970 Λ Transparent; vitreous to dull; colourless. Uniaxial (-), ω 1.584, c 1.660 Biaxial ( + ), α 1.528, ß 1.529, 7 1.531, 2V(meas.) 45°, 4.824(70), 3.919(80), 3.720(100), 3.313(90), 2.694(35), 2V(calc.) 71°. 2.676(70), 2.471(35). 6.53(55), 5.05(50), 4.85(65), 2.858(70), 2.597(50), IMA No. 90-009 2.229(50), 2.076(100). (Na,Ca,K)8(Si6Al6O24)(SO4)2C1.0.5H2O IMA No. 90-016 Hexagonal, P6 22 2 an orthorhombic polymorph of natisite a 12.843, c 32.239 A Na TiSiO Transparent; vitreous; green to greenish-yellow. 2 5 Orthorhombic, Pmma Uniaxial ( + ), ω 1.528, e 1.543 a 9.827, b 9.167, c 4.799 Ä 4.84(40), 3.711(100), 3.314(80), 3.035(20), 2.988(16), Translucent; adamantine; yellow, orange-yellow, 2.687(25), 2.470(16), 2.139(25). orange-brown. IMA No. 90-010 Biaxial ( + ), a 1.740, ß 1.741, 7 1.765, 2V(meas.) 20°, Fe8.2x[(As1.x,Sx)O4]6(OH)6.5H2O x is about 0.2 2V(calc.) 23°. Orthorhombic, Pbcm 2.748(100), 2.257(25), 1.720(30), 1.680(30), 1.475(33), a 6.412, b 19.45, c 8.941 A 1.443(35). Commission on New Minerals and Mineral Names - I.M.A. 1011 IMA No. 90-018 Transparent; vitreous; colourless to light a regular 1:1 interstratification of cookeite and pinkish-cream. paragonite Biaxial (-), α 1.540, ß 1.551, 7 1.557, 2V(meas.) 73°, Li0.5Na05Al3Si3AlO10(OH)5 2V(calc). 72°. Monoclinic, C2/m 6.89(70), 3.45(100), 3.26(90), 3.05(80), 2.880(70), a 5.158, b 8.914, c 23.83 Λ, ß 94.23° 2.715(70), 2.463(70). Transparent; pearly; white. Biaxial (-), α 1.58<<1.59, ß 1.58<<1.59, IMA No. 90-025 7 1.59 << 1.60, 2V(meas.) 30-50°. Na17Ca3Mg[Ti,Mn)4(Si2O7)2(PO4)6O3F5 11.89(70), 4.456(90), 4.325(90), 2.547(100), 2.476(70), Triclinic, PI 1.486(90). a 5.412, b 7.079, c 26.56 A, a 95.21°, ß 93.51°, 7 90.10° IMA No. 90-019 Translucent to transparent; vitreous to pearly; light the Mg-dominant analogue of chalcophanite brown. 4 + (Mg,Mn,CaJMn 3 Or3H2O Biaxial (-), α 1.600, ß 1.658, 7 1.676, 2V(meas.) 56°, Triclinic, PI 2V(calc). 57°. a 7.534, b 7.525, c 8.204 A, α 89.753°, ß 117.375°, 2.937(10), 2.702(9), 2.659(8), 2.048(8B), 1.771(5B), 7 120.000° 1.730(5). Opaque; dull; coffee black. In reflected light: grey, clear anisotropism, weak IMA No. 90-026 bireflectance, nonpleochroic. R-values: Na14CaMgT_i4(Si2O7)2(PO4)4O4F2 (23.0%)470nm, (193.9%)546nm, (19.1%)589nm, Triclinic, PI (18.6%)650nm. a 5.415, b 7.081, c 20.34 Λ, a '86.85°, ß 94.40°, 6.965(100), 5.539(3), 4.086(4), 3.522(3), 3.483(11), 7 89.94° 2.230(8). Translucent to transparent; vitreous to pearly; light brown. IMA No. 90-020 Biaxial (-), α 1.630, ß 1.678, 7 1.697, 2V(meas.) 62°, MnSO3.3H2O 2V(calc.) 63°. Orthorhombic, Pnma 2.880(10), 2.702(8B), 2.636(7), 2.050(5), 1.662(4B), a 9.762, b 5.639, c 9.558 A 1.600(5). Transparent; vitreous; colourless. Biaxial ( + ), α 1.590, ß 1.596, 7 1.636, 2V(meas.) 41°, IMA No. 90-027 2V(calc.) 43°. (Ca,Mn)4Be3Si6O17(OH)4.3H2O 6.83(S), 4.33(VS), 3.43(VS), 2.704(M), 2.666(M), Orthorhombic, space group unknown 2.414(M), 1.726(M). a 8.724, b 23.14, c 4.923 A Translucent; vitreous; white to pale grey or beige. IMA No. 90-021 Biaxial, average index of refraction is 1.604. the Ti-dominant analogue of lavenite 11.64(93), 5.80(68), 3.87(76), 3.16(74), 2.889(75)/ 2.837(100), 2.494(58). NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7OF Monoclinic, P^/a IMA No.