Formula: (Fe,Mn)3(PO4)2.3H2O
Origin of name: from phosphate and ferrium = iron
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 9.41 Å, b = 10.02 Å, c = 8.66 Å
Colour: colourless, pale green, dark reddish brown from alteration
Diaphaneity:
Luster: vitreous to resinous
Habit: crystals octahedral or tabular, in parallel groups, massive, granular, coarse fibrous
Hardness: 3 to 3.5
Specific gravity: 3.29
Cleavage: 1; {010} poor
Tenacity: uneven, brittle
Streak:
Synonyms/varieties:
Comments: series with reddingite and with kryzhanovskite
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