Mineral description : Tetradymite

Tetradymite and pyrite from Mångfallsberget, Sweden.
Tetradymite from Mångfallsberget, Sweden.

Mineral class Sulphides : Antimonite bismuthinite orpiment group.
Chemical formula Bi2Te2S
Crystal system Trigonal.
Habitus Pseudo hexagonal crystals. Granular or often as foliated aggregates.
Cleavage [0001] perfect, uneven fracture.
Hardness 1.5
Density 7.2-7.9, average 7.55
Color Steel gray, opaque.
Streak Gray, makes streak on paper.
Luster Metallic.
Description  
Occurance  
Associates  
Notes Type Locality: Zupkov (Zsubkó, Schubkau), Slovakia.
Locations A rare mineral with two good localities in Sweden.
  • Mångfallsberget, Boliden, Västerbotten. Good samples have been found in quartz tourmaline veins.
  • Boliden, Västerbotten. Good samples have been found in quartz tourmaline veins.

To sulphides index.
Mineral group index.
Main index.

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Last changed : 1998-08-18