Chvilevaite

Formula:  Na(Cu,Fe,Zn)2S2

Origin of name:  For Tatiana N. Chvileva, Russian economic geologist

 

Crystal system:  Hexagonal

Crystal class:  3m

Twinning:

Unit cell: a = 3.873 Å, c = 6.848 Å

 

Colour:  Bronze, tarnishing to sooty coating

Diaphaneity: Opaque

Luster:  Metallic

Habit:  Tabular, equant and prismatic grains, up to 0.5 mm

Hardness:

Specific gravity:  3.94

Cleavage:  1; {0001} perfect

Tenacity: Brittle

Streak:

 

Synonyms/varieties:

 

Comments:  Rapidly tarnishes to black sooty coating. Of hydrothermal origin with other common sulphide minerals

 

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