Mineral Information and Data:

Antimonselite
Sb2Se3 [CNMNC approved formula]

Named for the composition and relation to selite.

IMA status : Approved Species 1992 (IMA1992-003)
CLASSIFICATION 
Dana
(8th edition) :
02.11.02.02  
  (02) Sulfides - Including Selenides and Tellurides
  (02.11) where Am Bn Xp, with (m+n):p=2:3
  (02.11.02) Stibnite Group (Orthorhombic: Pbnm)
  
Nickel-Strunz
(10th edition) :
02.DB.05a
  (02) Sulfides
  (02.D) Metal Sulfides, M:S = 3:4 and 2:3
  (02.DB) M:S = 2:3
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 11.213 Å, b = 11.515 Å, c = 3.991 Å
Crystal Habit: Euhedral acicular crystals in radiating aggregates, to 1 mm; as very fine granular aggregates
  
Color: Black
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 3.3
Measured Density: 5.88 g/cm3
Streak: Black
  
Geologic Setting: In uraniferous calcite veins in a hydrothermal U–Hg–Mo polymetallic deposit (near Kaiyan, China).
Mineral Association: Pyrite, sphalerite, galena, ferroselite, clausthalite, uraninite, cinnabar, hematite, calcite (near Kaiyan, China); gold, clausthalite, selenian famatinite, selenian gersdorffite, trustedtite, selenian stibnite, quartz, barite (Qiongmo deposit, China)
  

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