Formula: CaMnFe(PO4)2(OH).2H2O
Origin of name: for Wilhelm Vierling (1901-1995), amateur mineralogist, Weiden, Bavaria, Germany, a long-time student of Hagendorf minerals.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.8, b = 18.5, c = 7.31
Colour: Pale yellow to brownish yellow, yellow
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Fine-grained radial fibrous aggregates
Hardness: 4
Specific gravity: 2.58
Cleavage: 1; {010} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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