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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axelsson@acc.umu.se

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Last changed : 1998-08-18

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.