Formula: NaCaCu5(AsO4)4Cl . 5H2O
Origin of name: From Latin lavendula = lavender
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell: a = 9.815 Ǻ, b = 40.39 Ǻ, c = 9.990 Ǻ
Colour: Blue-green, blue to lavender blue
Diaphaneity:
Luster: Vitreous to waxy, silky
Habit: Aggregates of fine flakes; thin botryoidal crusts
Hardness: 2.5
Specific gravity: 3.54
Cleavage: 2; {001} good; {110} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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