Mineral Information and Data:

Aleksite
PbBi2Te2S2 [CNMNC approved formula]

Named after the locality : In the Alekseev mine, Sutemskii region, Stanovoi Range, Russia.

IMA status : Approved Species 1978 (IMA1977-038)
CLASSIFICATION 
Dana
(8th edition) :
02.06.03.02  
  (02) Sulfides - Including Selenides and Tellurides
  (02.06) where Am Bn Xp, with (m+n):p=4:3
  (02.06.03) Kochkarite Group
  
Nickel-Strunz
(10th edition) :
02.GC.40a
  (02) Sulfides
  (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites
  (02.GC) Poly-sulfarsenites
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 4.238 Å, c = 79.76 Å
Crystal Habit: Platy grains, microscopic
  
Color: Pale gray with greenish tint in reflected light
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2 - 2.5
Measured Density: 7.8 (calculated) g/cm3
Cleavage: 1; {0001} perfect
  
Geologic Setting: Of hydrothermal origin in sulfide-quartz veins (Alekseev mine, Russia).
Mineral Association: Galena, gold, altaite, tetradymite, tsumoite, rucklidgeite, quartz (Alekseev mine, Russia)
  

 

Aleksite
Gray, metallic aleskite grains in quartz
with tellurobismuthite and Pb-bearing tetradymite.
Origin: St. David's Mine, Bontddu, Dogellau, Gwynedd, Wales, UK.
Sample size: 2.5x4.5 cm
Photo: Diederik Visser

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