Formula: Mg7(BO3)3(OH)4Cl0.4
Origin of name: For Franz Karl, German mineralogist
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell:
Colour: White to light green
Diaphaneity:
Luster: Silky
Habit: Needles and fibres, minute, in aggregates
Hardness: 5.5
Specific gravity: 2.80 to 2.85
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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