Carminite

Formula:  PbFe₂(AsO₄)₂(OH)₂

Origin of name:  From carmine, because of colour

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning:

Unit cell: a = 12.25 Ǻ, b =  16.52 Ǻ, c = 7.64 Ǻ

Colour:  Carmine red to reddish brown

Diaphaneity:

Luster:   Vitreous, pearly on cleavage

Habit:

Hardness:  3.5

Specific gravity:  5.22

Cleavage:  1; {100} distinct

Tenacity:  Brittle

Streak:  Reddish brown

Synonyms/varieties:

Comments: