Formula: K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3.15H2O
Origin of name: for Paul Kerr, American mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: light yellowish brown to colourless
Diaphaneity:
Luster: vitreous
Habit: crystals equant or flattened, to 0.2 mm
Hardness: 3
Specific gravity: 2.36
Cleavage: 1; {100} perfect
Tenacity:
Streak: colourless
Synonyms/varieties:
Comments:
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