Formula: NaCa2(Fe,Mn)4MgFe(PO4)6.2H2O
Origin of name: for Dr. Frederick John Wicks (b. 1937), curator Royal Ontario Museum, Toronto, Canada.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 12.896, b = 12.511, c = 11.634
Colour: Dark blue to dark green, bluish black, black
Diaphaneity: Opaque
Luster: Submetallic
Habit: plates, often striated, and masses
Hardness: 4.5 to 5
Specific gravity: 3.54
Cleavage: 1; {010} good
Tenacity:
Streak: Green
Synonyms/varieties:
Comments: isostructural with grischunite
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