Formula: FeFe2(PO4)2(OH)2.4H2O
Origin of name: for Robert Whitmore (1936-), micromount mineral collector of Weare and owner of the Palermo mine, New Hampshire, U.S.A.
Crystal system: Monclinic
Crystal class: 2/m
Twinning: universal on {100}
Unit cell: a = 10.00 Å, b = 9.73 Å, c = 5.47 Å, b = 93.8°
Colour: Pale tan, light yellow brown, deep brown to greenish brown
Diaphaneity: Transparent to translucent
Luster: Vitreous to subadamantine
Habit: crystals prismatic pseudo-orthorhombic, to 2 mm, acicular, twinned, in spherical aggregates and fan-like sprays
Hardness: 3
Specific gravity: 2.87
Cleavage: 1; {100}good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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