Sterryite

Formula: Ag2Pb10(Sb,As)12S29

Origin of name: for T. Sterry Hunt, Canadian mineralogist

 

Crystal system: orthorhombic

Crystal class: mm2 or 2/m 2/m 2/m

Twinning:

Unit cell: 

 

Colour: black

Diaphaneity: opaque

Luster: metallic

Habit: plumose, bundles of fibers

Hardness: 3.5

Specific gravity: 6.0

Cleavage: 1; perfect, parallel to elongation

Tenacity: 

Streak: black

 

Synonyms/varieties:

 

Comments: 

 

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