Alabandite
Sulfide mineral / From Wikipedia, the free encyclopedia
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Alabandite or alabandine, formerly known as manganese blende or bluemenbachite is a rarely occurring manganese sulfide mineral. It crystallizes in the cubic crystal system with the chemical composition Mn2+S and develops commonly massive to granular aggregates, but rarely also cubic or octahedral crystals to 1 cm.
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Alabandite | |
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General | |
Category | Sulfide mineral |
Formula (repeating unit) | MnS |
IMA symbol | Abd[1] |
Strunz classification | 2.CD.10 (10 ed) II/C.15-30 (8 ed) |
Dana classification | 2.8.1.4 |
Crystal system | Cubic |
Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
Space group | Fm3m |
Unit cell | a = 5.2236 Å; Z = 4 |
Identification | |
Color | black, steelgray, brownish-black |
Crystal habit | mostly massive or granular; cubic or octahedral crystals to 1 cm |
Twinning | Lamellar || {111} |
Cleavage | Perfect on {100} |
Fracture | Irregular, uneven |
Tenacity | Brittle |
Mohs scale hardness | 3.5 to 4 |
Luster | Sub-metallic |
Streak | Green |
Diaphaneity | Opaque, translucent in thin fragments |
Specific gravity | 4.053 |
Optical properties | Isotropic |
Refractive index | n = 2.70 |
References | [2][3] |
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