Stilleite

Formula: ZnSe

Origin of name: for Hans Stille, German geologist

 

Crystal system: cubic

Crystal class: -43m

Twinning:

Unit cell: 

 

Colour: gray

Diaphaneity: opaque to translucent

Luster: metallic

Habit: massive

Hardness: about 5

Specific gravity: 5.29

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: seen in polished section only

 

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