Formula: (Fe,Mn)2(PO4)F
Origin of name: locality Rabenstein, Zwiesel, Germany
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.046 Å, b = 6.446 Å, c = 9.888 Å, β = 107.42°
Colour: Clove-brown, alters to brownish black to black
Diaphaneity: Translucent
Luster: Vitreous to resinous
Habit: Crystals rough, poorly developed, massive, pseudocubic
Hardness: 5 to 5.5
Specific gravity: 3.93 to 3.97
Cleavage: 3; {001} good, {010} fair, {100} poor
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments: series with triplite
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