Formula: KFe2(Nb,Ta)(PO4)2O2.2H2O
Origin of name: for Milo Olmstead, American micromounter
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 7.478 Å, b = 10.04 Å, c = 80531 Å
Colour: deep brown to black
Diaphaneity:
Luster: subadamantine
Habit: crystals thin to thick tabular, smaller than 1 mm
Hardness: 4
Specific gravity: 3.36
Cleavage: 2; {100} and {001} good
Tenacity:
Streak: olive green
Synonyms/varieties:
Comments:
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