Černýite

Formula:  Cu₂CdSnS₄

Origin of name:  For Petr Černý, Canadian geologist, University of Manitoba, Winnipeg

Crystal system:  Tetragonal

Crystal class:  -42m

Twinning:

Unit cell: a = 5.487 Å, c = 10.848 Å

Colour:  Steel-gray

Diaphaneity: Opaque

Luster:  Metallic

Habit:  Microscopic anhedral to subhedral grains

Hardness:  4

Specific gravity:  4.618 to 4.776

Cleavage:  None

Tenacity:

Streak:  Black

Synonyms/varieties:

Comments: Found as a rare constituent of complex zoned pegmatites, as a component of a very minor sulfide mineral suite with pyrrhotite, sphalerite, hawleyite, chalcopyrite, stannite, bismuth and kësterite.