Formula: CaCu4(SO4)2(OH)6 . 3H2O
Origin of name: For Henri Deville, French chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 20.87 Å, b = 6.14 Å, c = 22.19 Å, β = 102.7°
Colour: White, bluish white, sky-blue, dark emerald-green
Diaphaneity:
Luster: Vitreous
Habit: Crystals flattened, hexagonal plates; crusts or rosettes
Hardness: 2.5
Specific gravity: 3.13
Cleavage: 4; {001} perfect, {110}, {101} and {10-1} distinct
Tenacity:
Streak: White to pale green
Synonyms/varieties: Devillite, herrengrundite, lyellite
Comments:
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