Formula: Fe3PO7
Origin of name: For Giuseppe Grattarola (1905-1988), professor of mineralogy at the University of Florence, Italy.
Crystal system: Trigonal
Crystal class: 3m
Twinning:
Unit cell: a = 7.994, c = 6.855
Colour: Brown, reddish brown
Diaphaneity: Opaque
Luster: Greasy
Habit: Aggregates
Hardness:
Specific gravity: 4.07
Cleavage: None
Tenacity: Brittle
Streak: Brown
Synonyms/varieties:
Comments:
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