Formula: H(Ca,Mn,Fe)Fe3(AsO4,PO4)4.7H2O
Origin of name: for Kurt Walenta (1927-), German mineralogist, University of Stuttgart, Germany, who has studied many phosphate minerals.
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 26.24, b = 10.31, c = 7.38
Colour: bright yellow-green, bright yellow, greenish yellow
Diaphaneity: Translucent
Luster: Vitreous
Habit: crystals thin bladed, to 60 microns, in rosette-like aggregates
Hardness: 3
Specific gravity: 2.72
Cleavage: 1; {010} perfect
Tenacity:
Streak: Yellow
Synonyms/varieties:
Comments:
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