General Information:
Chemical Formula:
Fe+++O3(PO4)
Composition:
(Molecular Weight = 198.82 gm)
Iron 28.09 % Fe
Phosphorus 15.58 % P
Oxygen 56.33 % O
Empirical Formula:
Fe3+PO7
Environment:
As nodules about 1 cm in diameter with cavities lined with aggregates up to 1 mm long.
IMA Status:
Approved IMA 1995
Locality:
The Castelnovo mine, Santa Barbara lignite area, Uppper Arno River Vally, 30 km SE of Florence, Italy
Name Origin:
For Giuseppe Grattarola (1905-1988), professor of mineralogy at the University of Florence, Italy.
Physical Properties:
Cleavage:
None
Color:
brown or red brown.
Density:
4.07
Diaphaniety:
Opaque
Habits:
Aggregates - Made of numerous individual crystals or clusters., ,
Luminescence:
Non-fluorescent.
Luster:
Greasy (Oily)
Streak:
brown
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