Chatkalite

Formula:  Cu₆FeSn₂S₈

Origin of name:  After locality; Chatkal-Kuramin Mts., Uzbekistan

Crystal system:  Tetragonal

Crystal class:  -42m

Twinning:

Unit cell: a = 7.61 Å, c = 5.373 Å

Colour:  Pale rose (reflected)

Diaphaneity:  Opaque

Luster:

Habit:  Microscopic rounded grains in tetrahedrite

Hardness:  4

Specific gravity:  5.0

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments: found as rounded dissemeinations in tetrahedrite, from sulfide bearing quartz vein