Formula: ScPO4 . 2H2O
Origin of name: For F. Kolbeck, German mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: On {100}
Unit cell: a = 5.42 Ǻ, b = 10.19 Ǻ, c = 8.89 Ǻ, β = 90.5°
Colour: Colourless, yellowish, bright blue to blue-grey
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals short prismatic, minute
Hardness: 5
Specific gravity: 2.44
Cleavage: 3; {110} fair, {100} and {001} poor
Tenacity: Conchoidal; brittle
Streak:
Synonyms/varieties: Eggonite, sterretite
Comments:
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