Formula: Ca2Co(AsO4)2 . 2H2O
Origin of name: For Gustav Rose, German mineralogist
Crystal system: Triclinic
Crystal class: Unknown
Twinning:
Unit cell: a = 5.88 Ǻ, b = 7.67 Ǻ, c = 5.58 Ǻ, α = 112.3°, β = 71.4°, γ = 119.7°
Colour: Dark rose-red
Diaphaneity:
Luster: Vitreous
Habit: Crystals not common; granular masses
Hardness: 3.5 to 4
Specific gravity: 3.71
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with roselite
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