Toyohaite

Formula: Ag₂FeSn₃S₈

Origin of name: after locality Toyoha mine, Hokkaido, Japan

Crystal system: Monoclinic

Crystal class: 2/m, 2 or m

Twinning:

Unit cell: a = 13.349, b = 26.538, c = 4.092, β = 92.77°

Colour: Gray, white in reflected light

Diaphaneity: Opaque

Luster: Metallic

Habit: grains 1 to 30 micron in aggregates up to 200 micron

Hardness:  4

Specific gravity: 7.25 (calculated)

Cleavage: none

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: from polished section