Bismutohauchecornite

Formula:  Ni₉Bi₂S₈

Origin of name:  From bismuth and hauchecornite

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning:

Unit cell: a = 7.37 Å, b = 7.37 Å, c = 5.88 Å

Colour:  Brownish yellow

Diaphaneity:m Opaque

Luster:  Metallic

Habit:  Crystals, elongated tabular; massive, grains

Hardness: 4.5

Specific gravity:  6.25

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments: Mineral of hydrothermal origin, as secondary pore-fillings and replacements of sandstone and conglomerate