Formula: (Mn,Fe,Mg)Al2(PO4)2(OH)2·8H2O
Origin of name: Named after Jürgen Kastning (1932-), from Reinbeck bei Hamburg, Germany, amateur mineralogist specializing in phosphate minerals, who discovered the mineral.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 7.0102, b = 10.205, c = 10.504, α = 71.82°, β = 89.62°, γ = 69.9°
Colour: Colourless, white, beige
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Thin, tabular
Hardness: 1-2
Specific gravity: 2.35
Cleavage:
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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