Formula: NaCu(SO4)2 . 2H2O
Origin of name: For B. Kröhnke, chemist who did first analysis
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: On {101}, sometimes heart-shaped
Unit cell: a = 5.80 Ǻ, b = 12.65 Ǻ, c = 5.51 Ǻ, β = 108.4°
Colour: Dark blue to dark sky blue, alters to greenish on exposure
Diaphaneity:
Luster: Vitreous to greasy
Habit: Crystals short prismatic or octahedral and somewhat elongated; massive, granular, columnar or fibrous crusts or aggregates
Hardness: 2.5 to 3
Specific gravity: 2.90
Cleavage: 2; {010} perfect, {-101} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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