Formula: Ba(Mn,Fe)2Fe2(PO4)3(OH)3
Origin of name: for Louis Perloff, American mineral collector
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 9.22 Å, b = 12.42 Å, c = 5.00 Å, b = 100.4°
Colour: darl brown to greenish brown to black
Diaphaneity:
Luster: vitreous to subadamantine
Habit: crystals spear-shaped, to 1 mm
Hardness: about 5
Specific gravity: 3.32
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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