Formula: FeFe4(SO4)6(OH)2 . 20H2O
Origin of name: Locality; Copiapo, Chile
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 7.34 Å, b = 18.76 Å, c = 7.38 Å, α = 91.5°, β = 102.2°, γ = 99.0°
Colour: Golden yellow to yellow to orangish yellow, greenish
Diaphaneity:
Luster: Pearly
Habit: Crystals thin tabular; loose aggregates of scales; crusts, granular
Hardness: 2.5 to 3
Specific gravity: 2.08 to 2.17
Cleavage: 2; {010} perfect, {-101} imperfect
Tenacity:
Streak:
Synonyms/varieties: Ferrocopiapite
Comments:
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