Gustavite

Formula: PbAgBi3S6

Origin of name:   For Gustav Hageman, chemical engineer, Greenland

 

Crystal system:   Orthorhombic

Crystal class:  2/m

Twinning:

Unit cell:

 

Colour:  Steel-gray

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Tabular grains

Hardness:  3 to 3.5

Specific gravity:  7.01

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  Series with lillianite

 

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