Formula: CuFe6(PO4)4(OH)8 . 4H2O
Origin of name: From composition chalkos = copper sideros = iron
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 7.86 Ǻ, b = 10.20 Ǻ, c = 7.90 Ǻ, α = 112.5°, β = 115.3°, γ = 69.0°
Colour: Dark green
Diaphaneity:
Luster: Vitreous
Habit: Crystals short prismatic; sheaf-like groups of distinct crystals; crusts
Hardness: 4.5
Specific gravity: 3.22
Cleavage: 2; {001} perfect, {010} good
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with turquoise
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