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New minerals recently approved.

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.

Each mineral is described in the following format:

Chemical Formula

IMA No. (any relationship to other minerals) Crystal system, space group unit cell parameters Color; luster; diaphaneity. Optical properties. Strongest lines in the X-ray powder diffraction pattern.

The underlined space is provided to write in the name when published.

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

1993 PROPOSALS

[Na.sub.3][(Ca,REE,Sr).sub.3][(C[O.sub.3]).sub.5]

IMA No. 93-001 The calcium-analogue of burbankite and khanneshite. Hexagonal: P[6.sub.3]mc, P[6.sub.2]c or P[6.sub.3]/mmc a 10.447 c 6.318 [angstrom] Deep orange; vitreous; translucent. Uniaxial (-), [Omega] 1.636, [Epsilon] 1,631. 5.20 (4), 3.68 (3), 3.01 (5), 2.601 (10), 2.130 (6), 1,649 (3).

Ni[Mn.sub.3][0.sub.7][center dot]3[H.sub.2]0

IMA No. 93-002 The nickel-analogue of chalcophanite. Hexagonal (trigonal): [Mathematical Expression Omitted] or R3 a 7.514 c 20.52 [angstrom] Very dark brown to almost black; submetallic to vitreous; opaque, but translucent in thin plates. Uniaxial (-), [Omega] [greater than] 2.00, [Epsilon] 1.97. 6.84 (10), 4.01 (2), 2.219 (3), 1.884 (2), 1.575 (2).

AlAs[O.sub.4]

IMA No. 93-003 The arsenate-analogue of berlinite. Hexagonal (trigonal): P[3.sub.1]21 or P[3.sub.2]21 a 5.031 c 11.226 [angstrom] Colorless, white, cream; vitreous; transparent. Uniaxial (+), [Omega] 1.596, [Epsilon] 1,608. 4.36 (20), 4.06 (31), 3.442 (100), 2.359 (15), 1.873 (16), 1.4202 (11).

[K.sub.3][Cu.sub.3]Al[O.sub.2][(S[O.sub.4]).sub.4]

IMA No. 93-004 The aluminum-analogue of klyuchevskite. Monoclinic: I2 a 18.423 b 5.139 c 18.690 [angstrom] [Beta] 101.72 [degrees] Dark green; vitreous; transparent. Biaxial (+), [Alpha] 1.542, [Beta] 1.548, [Gamma] 1.641, 2V(meas.) unknown, 2V(calc.) 30 [degrees]. 9.15 (84), 9.04 (100), 7.20 (52), 3.781 (37), 3.757 (33), 2.786 (21).

N

[Si.sub.2][O.sub.7]][O.sub.2]F[center dot][H.sub.2]O

IMA No. 93-005 Orthorhombic: Pnma a 23.42 b 12.266 c 7.181 [angstrom] Black with a green shade; vitreous to greasy; translucent. Biaxial (+), [Alpha] 1,767, [Beta] 1.793, [Gamma] 1.871, 2V(meas.) 60-65 [degrees], 2V(calc.) 62 [degrees]. 4.580 (5), 3.303 (9), 2.999 (10), 2.715 (5), 2.655 (10), 2.156 (4), 1.648 (5).

BiAs[O.sub.4]

IMA No. 93-006 A tetragonal polymorph of rooseveltite. Tetragonal: I[4.sub.1]/a a 5,085 c 11.69 [angstrom] White to yellowish white; earthy; opaque. Uniaxial (+), mean n [greater than] 2.0. 4.660 (11), 3.066 (100), 2.546 (12), 1.797 (11), 1.581 (10), 1.551 (17).

N[H.sub.4]B[F.sub.4]

IMA No. 93-008 Orthorhombic: Pnma a 9.0615 b 5.6727 c 7.2672 [angstrom] Colorless to white and yellowish; vitreous; transparent to translucent. Biaxial, mean n calculated from Gladstone-Dale is 1.308. 4.472 (75), 3.540 (90), 3.183 (100), 2.8982 (80), 2.5362 (65), 2.2822 (65), 2.1631 (70).

[Bi.sub.2][O.sub.3]

IMA No. 93-009 A tetragonal polymorph of bismite. Tetragonal: P42/n or P[4.sub.2][2.sub.1]2 a 8.08 c 6.46 [angstrom] Green, yellowish; adamantine; translucent. Uniaxial (+), [Omega] 2.13, [Epsilon] 2.18. 5.73 (7), 3.44 (5), 3.16 (10), 3.01 (4), 2.56 (4dif.), 2.02 (5), 1.902 (6).

[Na.sub.2]Ca[Mg.sub.7][(P[O.sub.4]).sub.6]

IMA No. 93-010 The magnesium analogue of fillowite and johnsomervilleite. Hexagonal (trigonal): [Mathematical Expression Omitted] a 14.967 c 42.595 [angstrom] Colorless; vitreous; transparent. Uniaxial, indices of refraction calculated from reflectance values: n, 1.60, [n.sub.2] 1.62. 3.694 (S), 3.558 (M), 2.960 (S), 2.753 (S), 2.500 (M), 2.126 (M), 1.851 (M).

[Cu.sub.3]Mo[O.sub.4][(OH).sub.4]

IMA No. 93-011 Orthorhombic: Pnnm a 8.499 b 12.527 c 6.067 [angstrom] Dark green; adamantine; transparent. Biaxial (+), [Alpha] slightly [less than] 1.89, [Beta] unknown, [Gamma] slightly [less than] 1.91, 2V(meas.) 74 [degrees]. 5.471 (S), 3.754 (S), 3.043 (S), 2.591 (VS), 1.519 (S).

CaSrAl[(F, OH).sub.7]

IMA No. 93-013 Monoclinic: P[2.sub.1]/c a 8.215 b 11.989 c 6.076 [angstrom] [Beta] 96.22 [degrees] Colorless; vitreous; transparent. Biaxial (+), [Alpha] 1.4240, [Beta] 1.4320, [Gamma] 1.4415, 2V(meas.) 85.5 [degrees], 2V(calc.) 85.6 [degrees]. 6.758 (7), 4.250 (9), 3.643 (8), 3.148 (7), 3.063 (8), 3.030 (7), 2.840 (7), 2.125 (8).

IrBiTe

IMA No. 93-016 Cubic: Pa3 a 6,502 [angstrom] Steel black; metallic; opaque. In reflected light: bright white with a yellowish tint, moderate anisotropism, no bireflectance, nonpleochroic. R: (51.0%) 470nm, (52.6%) 546nm, (52.9%) 589nm, (49.2%) 650nm. 2.89 (70), 1.955 (100), 1.735 (80), 1.250 (80), 1.207 (70), 1.148 (70), 1.054 (70).

[Ir.sub.1-x][Te.sub.2] x = 0.24

IMA No. 93-017 Cubic: Pa3 a 6.413 [angstrom] Steel black; metallic; opaque. In reflected light: bright white with bluish tint, no anisotropism, no bireflectance, nonpleochroic. R: (44.3%) 470nm, (46.0%) 546nm, (46.9%) 589nm, (45.5%) 650nm. 2.86 (70), 1.93 (100), 1.235 (80), 1.132 (90), 1.040 (80), 0.9780 (80).

Ir[Te.sub.2]

IMA No. 93-018 Hexagonal: [Mathematical Expression Omitted] a 3.933 c 5.390 [angstrom] Steel black; metallic; opaque. In reflected light: bright yellowish white with bluish tint, moderate anisotropism with bluish or yellowish tint, no bireflectance, nonpleochroic. [R.sub.O] & [R.sub.E]: (41.4, 49.0%) 470nm, (40.2, 48.2%) 546nm, (41.1, 49.0%) 589nm, (45.2, 51.2%) 650nm. 2.85 (100), 2.10 (80), 1.95 (60), 1.580 (70), 1.160 (60), 1.110 (70).

[Bi.sub.6][Te.sub.2][O.sub.t3]

IMA No. 93-019 Orthorhombic: space group unknown a 5.689 b 10.791 c 5.308 [angstrom] Yellow green to light green; adamantine; transparent. Biaxial n's [greater than] 2. In reflected light, R: (14.8%) 470nm, (13.0%) 546nm, (13.2%) 589nm, (13.6%) 650nm. 3.146 (100), 2.841 (80), 2.694 (20), 1.956 (10), 1.695 (20), 1.631 (10).

[

S[O.sub.4], Cr[O.sub.4].sub.12][center dot]12[H.sub.2]O

IMA No. 93-020 The selenate-dominant analogue of 93-021 Hexagonal: [Mathematical Expression Omitted] a 9.590 c 27.60 [angstrom] Pale yellow; vitreous; transparent. Uniaxial (-), [Omega] 1.655, [Epsilon] 1.642. 13.75 (30), 7.10 (20), 3.974 (16), 3.561 (100), 3,082 (32), 3.058 (39), 2.715 (39).

[

ub.12][center dot]12[H.sub.2]O

IMA No. 93-021 The sulfate-dominant analogue of 93-020 Hexagonal: [Mathematical Expression Omitted] a 9.4643 c 27.336 [angstrom] Pale yellow; vitreous: transparent. Uniaxial (-), [Omega] 1.622, [Epsilon] 1.615. 13.67 (50), 7.05 (40), 3.927 (100), 3.515 (24), 3.023 (41), 2.681 (33), 2.3273 (21).

CaNa[B.sub.5][O.sub.8][(OH).sub.2][center dot]3[H.sub.2]O

IMA No. 93-022 Monoclinic: P[2.sub.1]/c a 6.506 b 13.280 c 11.462 [angstrom] [Beta] 92.97 [degrees] White; silky to pearly; translucent. Biaxial (-), [Alpha] 1.540, [Beta] 1.554, [Gamma] 1.558, 2V(meas.) 60 [degrees], 2V(calc.) 56 [degrees]. 8.64 (100), 6.62 (30), 4.18 (17), 2.868 (26), 2.845 (16), 2.795 (17), 2,587 (15).

Al[Ca.sub.2][(S[O.sub.4]).sub.2][F.sub.2]Cl[center dot]4[H.sub.2]O

IMA No. 93-023 Tetragonal: I4/m a 6.859 c 13.310 [angstrom] White; vitreous; transparent. Uniaxial (+), [Omega] 1.509, [Epsilon] 1.526. 6.67 (60), 3.922 (50), 3.729 (40), 3.431 (100), 3.335 (80), 3:052 (40), 2.483 (40).

NaAlZr[(P[O.sub.4]).sub.2][(OH).sub.2][center dot][H.sub.2]O

IMA No. 93-024 Monoclinic: space group unknown a 20.840 b 9.871 c 11.195 [angstrom] [Beta] 104.41 [degrees] Pale pinkish orange; vitreous; translucent. Biaxial, n's vary from 1.62 (parallel to fibres) to 1.64 (normal to fibres) 8.865 (40), 4.128 (80), 3.711 (65), 3.465 (60), 3.243 (35), 2.603 (100).

TIPb[(As,Sb).sub.3][S.sub.6]

IMA No. 93-025 Monoclinic: P[2.sub.1]/a a 8.444 b 23.97 c 5.844 [angstrom] [Beta] 113.58 [degrees] Brilliant black, but dark red in thin fragments; metallic to submetallic; opaque, but translucent in thin fragments. In reflected light: greyish white, clearly visible anisotropism from bluish to very weak reddish, visible bireflectance, nonpleochroic. [R.sub.min] & [R.sub.max]: (29.7, 35.4%) 470nm, (28.8, 33.1%) 546nm, (26.7 30.3%) 589nm, (26.6, 29.9%) 650nm. 5.346 (32), 3.998 (74), 3.816 (54), 3.587 (86), 2.823 (100), 2.778 (84), 2.670 (58).

[Mathematical Expression Omitted]

IMA No. 93-026 A member of the amphibole group Monoclinic: C2/m a 9.792 b 17.938 c 5.3133 [angstrom] [Beta] 103.87 [degrees] Bluish black to black; vitreous; opaque. Biaxial (+), [Alpha] 1.675, [Beta] 1.683, [Gamma] 1.694, 2V(meas.) 87 [degrees], 2V(calc.) 81 [degrees]. 8.426 (45), 4.481 (54), 3.404 (57), 2.985 (38), 2.710 (100), 2.585 (38), 2.536 (92).

AuSn

IMA No. 93-028 Hexagonal: P[6.sub.3]/mmc a 4.316 c 5.510 [angstrom] White, greyish-black to black (when oxidized); metallic; opaque. In reflected light: white with light yellow tint, clear anisotropism light yellow with a brown tint, faint bireflectance, nonpleochroic. [R.sub.O] & [R.sub.E]: (65.4, 65.2 %) 470nm, (76.7, 74.8%) 546nm, (80.5, 77.9%) 589nm, (82.8, 79.5%) 650nm. 3.726 (34), 3.087 (38), 2.218 (100), 2.159 (57), 1.546 (31), 1.258 (25), 1.256 (26).

[Na.sub.3]Sr(P[O.sub.4])(C[O.sub.3])

IMA No. 93-030 Monoclinic: P[2.sub.1] a 9.187 b 6.707 c 5.279 [angstrom] [Beta] 89.98 [degrees] Colorless to white; vitreous; transparent. Biaxial (-), [Alpha] 1.520, [Beta] 1.564, [Gamma] 1.565, 2V(meas.) 20 [degrees], 2V(calc.) 17 [degrees]. 3.35 (50), 2.708 (100), 2.648 (90), 2.172 (100), 2.080 (50), 1.891 (80), 1.676 (50), 1.415 (70).

PbAl[(F,OH).sub.5]

IMA No. 93-031 Triclinic: P1 or [Mathematical Expression Omitted] a 6.259 b 6.791 c 5.053 [angstrom] [Alpha] 90.92 [degrees] [Beta] 107.45 [degrees] [Gamma] 104.45 [degrees] White to colorless; vitreous; transparent. Biaxial (-), [Alpha] 1.629, [Beta] 1.682, [Gamma] 1.691, 2V(meas.) 41 [degrees], 2V(calc.) 44 [degrees]. 4.42 (100), 4.05 (35), 3.221 (40), 2.595 (70), 2.190 (65), 2.030 (50), 2.015 (40).

CaVOSi[O.sub.4]

IMA No. 93-032 Monoclinic: C2/c a 6.526 b 8.691 c 7.032 [angstrom] [Beta] 113.88 [degrees] Deep red; adamantine; transparent. Biaxial (sign unknown), [Alpha] [similar to] 1.95, [Beta] unknown, [Gamma] 2.105, 2V(meas.) unknown. 4.90 (W), 3.22 (VS). 2.97 (M), 2.59 (S), 2.271 (W), 1.641 (W).

[(Y,Ca,Na,REE).sub.4][Si.sub.5][O.sub.15][center dot]n[H.sub.2]O n [similar to] 4

IMA No. 93-034 Triclinic: P1 or P1 a 9.245 b 9.684 c 5.510 [angstrom] [Alpha] 97.44 [degrees] [Beta] 100.40 [degrees] [Gamma] 116.70 [degrees] White; vitreous; translucent. Biaxial (-), [Alpha] 1.602, [Beta] 1.607, [Gamma] 1.611, 2V(meas.) 73 [degrees], 2V(calc.) 83 [degrees]. 8.44 (80), 8.01 (50), 4.51 (50), 3.76 (70), 2.973 (100), 2.930 (60).

[(Cr,V).sub.2][Ti.sub.3][O.sub.9]

IMA No. 93-035 The chromium-dominant analogue of schreyerite Monoclinic: C2/c, Cc, P[2.sub.1]/c, P2/c or Pc a 7.03 b 5.02 c 18.83 [angstrom] [Beta] 119.60 [degrees] Black; metallic; opaque. In reflected light: white, faint anisotropism, faint bireflectance, faint pleochroism pale brown. [R.sub.min.] & [R.sub.max.]: (18.1, 20.1%) 470nm, (18.5, 19.9%) 546nm, (18.4, 19.8%) 589nm, (18.6, 20.9%) 650nm. 2.88 (2), 2.75 (3), 2.43 (2), 1.635 (3), 1.386 (2).

BaCu[Si.sub.4][O.sub.10]

IMA No. 93-036 Tetragonal: P4/ncc a 7.441 c 16.133 [angstrom] Blue; vitreous; transparent. Uniaxial (-), [Omega] 1.633, [Epsilon] 1.593. 8.055 (100), 4.031 (35), 3.544 (15), 3.200 (21), 2.688 (18), 2.395 (19), 2.016 (26).

NaK[Zr.sub.2](Be,Al,Ca,Mn)[(P[O.sub.4]).sub.4][center dot]2[H.sub.2]O

IMA No. 93-037 The K-dominant analogue of gainesite Tetragonal: I[4.sub.1]/amd a 6.570 c 17.142 [angstrom] Intense bluish purple or pale lilac; vitreous; transparent. Uniaxial (+), [Omega] 1.624, [Epsilon] 1.636. 6.161 (100), 4.291 (25), 3.286 (50), 3.039 (30), 2.895 (20).

Na[(REE,Ca).sub.2][F.sub.6]

IMA No. 93-038 Hexagonal: [Mathematical Expression Omitted] a 6.099 c 11.066 [angstrom] Pale pink to colorless; vitreous; transparent. Uniaxial (+), [Omega] 1.483, [Epsilon] 1.503. 5.29 (70), 3.036 (100), 2.146 (70), 1.757 (80), 1.152 (40), 0.9189 (40).

[Bi.sub.2]O(OH)(P[O.sub.4])

IMA No. 93-040 The P[O.sub.4]-analogue of atelestite and a monoclinic polymorph of petitjeanite Monoclinic: P[2.sub.1]/c a 6.954 b 7.494 c 10.869 [angstrom] [Beta] 107.00 [degrees] White to yellow; adamantine; translucent. Biaxial (+), [Alpha] 2.05, [Beta] 2.06, [Gamma] 2.09, 2V(meas.) 45 [degrees], 2V(calc.) 61 [degrees]. 4.268 (17), 3.271 (51), 3.254 (100), 3.145 (34), 2.727 (29), 1.885 (16).

[Mathematical Expression Omitted]

IMA No. 93-041 Orthorhombic: Pcab a 11.130 b 11.139 c 10.725 [angstrom] Black to very dark red-brown; sub-metallic to adamantine; opaque. In reflected light: grey with slight bluish tinge, weak anisotropism (dull and dark greys and browns), weak to moderate bireflectance, nonpleochroic. [R.sub.min.] & [R.sub.max.]: (11.4, 12.15 %) 470nm, (10.95, 11.6%) 546nm, (10.85, 11.5%) 589nm, (10.7, 11.2%) 650nm. 4.84 (50), 2.969 (70), 2.786 (70), 2.648 (100), 2.419 (60), 1.580 (50).

[(Mg,Al,[Fe.sup.2+]).sub.9][(Si,Al).sub.6][O.sub.15][(OH).sub.12]

IMA No. 93-042 A regular interstratification of amesite and clinochlore Monoclinic: Cm a 5.323 b 9.214 c 21.45 [angstrom] [Beta] 94.43 [degrees] Colorless to very pale green; nacreous; translucent. Biaxial (+), [Alpha] 1.575, [Beta] 1.575, [Gamma] 1.581, 2V(meas.) 0 [degrees], 2V(calc.) 0 [degrees]. 7.1 (100), 4.61 (60), 3.560 (80), 2.557 (40), 2.427 (60), 1.536 (70).

NaSb[O.sub.3]

IMA No. 93-044 Isostructural wuth ilmenite and geikielite Hexagonal: [Mathematical Expression Omitted] a 5.301 c 15.932 [angstrom] Colorless; pearly; transparent. Uniaxial (-), [Omega] 1.1.84, [Epsilon] 1.631. 5.30 (53), 3.00 (55), 2.650 (67), 2.365 (69), 1.874 (100), 1.471 (69).

[K.sub.2]Fe[(S[O.sub.4]).sub.2][center dot]4[H.sub.2]O

IMA No. 93-045 The Fe-analogue of leonite Monoclinic: C2/m a 11.843 b 9.552 c 9.945 [angstrom] [Beta] 94.89 [degrees] Colorless to light yellow; vitreous; transparent. Biaxial (+), [Alpha] 1.497, [Beta] 1.501, [Gamma] 1.509, 2V(meas.) 73 [degrees], 2V(calc.) 71 [degrees]. 4.776 (30), 3.504 (52), 3.439 (100), 3.330 (48), 3.051 (29), 2.405 (30), 2.389 (49).

[(Rh,Ir,Pt).sub.3][S.sub.4]

IMA No. 93-046 Monoclinic: F2/m a 13.44 b 10.749 c 10.448 [angstrom] [Beta] 118.32 [degrees] Megascopic color not observed; metallic; opaque. In reflected light: pale slightly brownish grey, weak anisotropism in greys and browns, weak bireflectance, pleochroism weak. [R.sub.1] & [R.sub.2]: (47.2, 48.9%) 470nm, (48.4, 50.3%) 546nm, (49.1, 50.7%) 589nm, (49.8, 51.0%) 650nm. 3.156 (100), 3.081 (100), 2.957 (90), 2.234 (60), 1.871 (80), 1.791 (90), 1.532 (70).

[Cu.sub.2][Te.sup.6+][O.sub.4][(OH).sub.2]

IMA No. 93-047 Monoclinic: P[2.sub.1]/n a 9.095 b 5.206 c 4.604 [angstrom] [Beta] 98.69 [degrees] Medium leaf green; adamantine; transparent. In reflected light: pale grey, weak anisotropism with brown rotation tints, weak bireflectance, nonpleochroic. The mean index of refraction calculated from the reflectances at 589nm is 2.00. 4.506 (40), 4.337 (60), 3.838 (50), 2.891 (70), 2.598 (100), 1.834 (40), 1.713 (40), 1,500 (40).

[Bi.sub.2][([Fe.sup.3+],Cu).sub.2]O[(OH).sub.3][(As[O.sub.4]).sub.2]

IMA No. 93-048 Triclinic: P1 or [Mathematical Expression Omitted] a 4.569 b 6.162 c 8.993 [angstrom] [Alpha]94.56 [degrees] [Beta] 99.68 [degrees] [Gamma] 94.31 [degrees] Brown-yellow; adamantine; transparent to translucent. Biaxial (-), [Alpha] 2.04, [Beta] 2.10 (calc.), [Gamma] 2.11, 2V(meas.) 45 [degrees]. 8.822 (62), 3.749 (100), 3.596 (77), 3.468 (58), 2.903 (69) 2.810 (51), 2.685 (48).

[Ca.sub.3][B.sub.2][O.sub.6]

IMA No. 93-049 Hexagonal: [Mathematical Expression Omitted] or R3c a 8.638 c 11.850 [angstrom] Greyish white; vitreous; transparent. Uniaxial (-), [Omega] 1.726, [Epsilon] 1.630. 2.915 (100), 2.756 (61), 2.493 (44), 2.160 (19), 2.044 (21), 1.976 (18), 1.895 (75).

[Tl.sub.5][Sb.sub.9][(As,Sb).sub.4][S.sub.22]

IMA No. 93-050 Triclinic: [Mathematical Expression Omitted] a 7.393 b 8.707 c 17.58 [angstrom] [Alpha] 103.81 [degrees] [Beta] 91.79 [degrees] [Gamma] 109.50 [degrees] Black; metallic; opaque. In reflected light: white, distinct to strong anisotropism with blue or blue-green colors, weak to medium bireflectance, pleochroism white to white with grey-blue tints. [R.sub.min.] & [R.sub.max.]: (34.0, 36.7%) 470nm, (32.0, 34.9%) 546nm, (30.5, 33.0%) 589nm, (28.1, 29.7%) 650nm. 3.459 (100), 3.388 (64), 3.177 (54), 3.076 (65), 2.802 (44), 2.287 (57), 1.736 (38).

[Fe.sub.4][S.sub.8]O

IMA No. 93-051 Monoclinic: space group unknown a 9.717 b 7.280 c 6.559 [angstrom] [Beta] 95.00 [degrees] Yellow; metallic; opaque. In reflected light: yellow, strong anisotropism with orange, yellow-orange and greenish grey colors, distinct bireflectance, pleochroism greyish brown, orange, yellow orange. [R.sub.min.] & [R.sub.max].: (19.5, 32.1%) 470nm, (23.8, 36.8%) 546nm, (24.6, 37.4%) 589nm, (25.1, 37.3%) 650nm. 2.709 (10), 2.419 (8), 2.323 (7), 1.92 (6), 1.758 (8), 0.9605 (6), 0.9576 (7).

Ca[Al.sub.4][O.sub.7]

IMA No. 93-052 Monoclinic: C2/c a 12.94 b 8.910 c 5.446 [angstrom] [Beta] 107.0 [degrees] Colorless to white; vitreous; transparent. Biaxial (+), [Alpha] 1.6178, [Beta] 1.6184, [Gamma] 1.6516, 2V(meas.) 12 [degrees], 2V(calc.) 15.5 [degrees] (synthetic material). 4.460 (43), 3.609 (13), 3.515 (100), 2.882 (13), 2.605 (36), 2.440 (21), 1.764 (20).

[Pb.sub.2]OC[O.sub.3]

IMA No. 93-053 Orthorhombic: P[2.sub.1][22.sub.1] or P[2.sub.1][2.sub.1][2.sub.1] a 9.294 b 9.000 c 5.133 [angstrom] White; waxy; transparent to opaque. The mean index of refraction calculated from the reflectance value at 589nm is 2.09. 6.49 (30), 4.02 (40), 3.215 (100), 3.181 (90), 2.858 (40), 2.564 (35).

Fe[Se.sub.2]

IMA No. 93-054 The Se-analogue of pyrite Cubic: Pa3 a 5.783 [angstrom] Black; metallic; opaque. In reflected light: pink-yellow, no anisotropism, no bireflectance, nonpleochroic. R: (42.4%) 470nm, (42.7%) 546nm, (45.7%) 589nm, (49.8%) 650nm. 2.888 (50), 2.588 (100), 2.364 (80), 2.045 (40), 1.743 (50), 1.546 (60), 1.1131 (40).

[Na.sub.3][K.sub.6][Ti.sub.2][Al.sub.2][Si.sub.8][O.sub.26][Cl.sub.3]

IMA No. 93-055 Monoclinic: C2/m a 10.37 b 16.32 c 9.16 [angstrom] [Beta] 105.6 [degrees] Colorless; vitreous; transparent. Biaxial (+), [Alpha] 1.601, [Beta] 1.625, [Gamma] 1.654, 2V(meas.) 85 [degrees], 2V(calc.) 86 [degrees]. 8.22 (71), 3.50 (42), 3.157 (35), 3.049 (100), 2.900 (71), 2.835 (84).

[Mathematical Expression Omitted]

IMA No. 93-056 Hexagonal: R a 9.863 c 79.45 [angstrom] Colorless; adamantine; transparent. Uniaxial (-), [Omega] 1.845, [Epsilon] 1.815. 13.4 (50), 4.43 (30), 3.98 (30), 3.32 (100), 3.11 (40), 2.969 (40), 2.671 (80).

[Pd.sub.3][Ni.sub.2][As.sub.3]

IMA No. 93-057 Hexagonal: P[6.sub.3]/m, P[6.sub.3] or P[6.sub.3]22 a 8.406 c 6.740 [angstrom] Megascopic color not observed; metallic; opaque. In reflected light: rose, distinct anisotropism from light grey to greyish-brown, no bireflectance, nonpleochroic. [R.sub.min.] & [R.sub.max.]: (48.4, 50.2%) 470nm, (51.2, 53.2%) 546nm, (53.2, 55.3%) 589nm, (56.6, 58.7%) 650nm. 2.626 (10), 2.477 (10), 2.429 (8), 2.283 (7), 1.978 (7), 1.818 (7), 1.781 (7).

[

]F[center dot]12[H.sub.2]O

IMA No. 93-058 Monoclinic: Pm, P2 or P2/m a 5.468 b 7.18 c 31.1 [angstrom] [Beta] 94.0 [degrees] Colorless, white, silvery, pale pink or cream; greasy to pearly; transparent to translucent. Biaxial (+), [Alpha] 1.608, [Beta] 1.630, [Gamma] 1.660, 2V(meas.) 82 [degrees], 2V(calc.) 83 [degrees]. 15.56 (9), 5.16 (6), 3.11 (10), 2.850 (7), 2.665 (7), 2.627 (7), 2.217 (6), 1.795 (6).

[Sb.sub.2][O.sub.3][center dot]W[O.sub.3] or [Sb.sub.2]W[O.sub.6]

IMA No. 93-059 Orthorhombic: probably P[22.sub.1][2.sub.1] a 8.59 b 9.58 c 6.12 [angstrom] Green to dark green; pearly to dull; translucent to opaque. Biaxial (+), [Alpha] 2.285, [Beta] 2.40, [Gamma] 2.58, 2V(meas.) large, 2V(calc.) 82 [degrees]. 3.32 (10), 3.06 (10), 2.98 (4), 2.73 (6), 2.46 (5), 1.919 (4).

[Cu.sub.2][(OH).sub.3]Cl

IMA No. 93-060 A monoclinic polymorph of atacamite, botallackite and paratacamite Monoclinic: P[2.sub.1]/n a 6.157 b 6.814 c 9.104 [angstrom] [Beta] 99.65 [degrees] Green to dark greenish black; adamantine; translucent to transparent. Biaxial (-), indices of refraction could not be measured because mineral reacts with immersion liquids, 2V(meas.) 75 [degrees]. 5.44 (100), 2.887 (40), 2.767 (60), 2.742 (70), 2.266 (60), 2.243 (50), 1.704 (50).

[(Ba,Pb).sub.6][(Cu,Fe,Ni).sub.25][S.sub.27]

IMA No. 93-061 Cubic: Pm3m a 10.373 [angstrom] Megascopic color unknown; metallic; opaque. In reflected light: pale brownish grey, no anisotropism, no bireflectance, nonpleochroic. R: (22.0%) 470nm, (24.85%) 546nm, (26.2%) 589nm, (27.55%) 650nm. 3.460 (40), 3.281 (40), 2.996 (90), 2.378 (90), 1.835 (100), 1.779 (40).

[(Pd,Ag).sub.2]Te

IMA No. 93-062 Tetragonal: P[4.sub.2]22, P[4.sub.2]/m or P[4.sub.2] a 8.913 c 6.098 [angstrom] Megascopic color unknown; metallic; opaque. In reflected light: brownish-rose, distinct to strong anisotropism from white to rose-brown, distinct bireflectance, pleochroic from brownish-grey to violet-rose. [R.sub.min.] & [R.sub.max.]: (38.7, 48.7%) 470nm, (44.0, 55.5%) 546nm, (47.3, 58.2%) 589nm, (50.7, 60.7%) 650nm. 3.051 (6), 2.825 (10), 2.553 (4), 2.231 (6), 2.042 (5), 1.326 (3).
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Publication:The Mineralogical Record
Date:Mar 1, 1995
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