Tillmannsite

FormulaAg3Hg(V,As)O4

Origin of name: 

 

Crystal system: Tetragonal

Crystal class: 4

Twinning: 

Unit cell: a = 7.727, c = 4.648

 

Colour: Red, brownish red

Diaphaneity: Translucent

Luster: Adamantine

Habit: Aggregates, pseudo-octahedral crystals

Hardness

Specific gravity: 7.733 (calculated)

Cleavage: None

Tenacity: Brittle, conchoidal fracture

Streak: Brownish red

 

Synonyms/varieties:

 

Comments: 

 

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