Formula: K2Ca2Cu(SO4)4 . 2H2O
Origin of name: For T. Leighton, Chilean mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 11.67 Ǻ, b = 16.52 Ǻ, c = 7.49 Ǻ
Colour: Pale bluish green, pale blue
Diaphaneity:
Luster: Vitreous
Habit: Crystals lath-like, rarely equant; crusts and cross-fibre veinlets
Hardness: 3
Specific gravity: 2.95
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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