Formula: (Fe,Mn)2(PO4)(OH)
Origin of name: for Caleb Wroe Wolfe (1908-1980), American crystallographer, professor of geology, Boston University
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.2, b = 13.17, c = 9.79, β = 108°
Colour: Reddish brown to dark clover-brown, greenish
Diaphaneity: Transparent to translucent
Luster: Vitreous to greasy
Habit: Crystals prismatic, striated vertically, columnar to parallel fibrous aggregates, divergent fibrous, granular
Hardness: 4.5 to 5
Specific gravity: 3.79
Cleavage: 2; {100} good, {120} fair, {010} poor, {110} very poor
Tenacity: Conchoidal to uneven fracture
Streak: Whitish
Synonyms/varieties:
Comments: dimorphous with satterlyite, series with triploidite
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