General Information:
Chemical Formula:
Fe+++Fe+++2(PO4)2(OH)3·5(H2O)
Composition:
(Molecular Weight = 516.60 gm)
Iron 32.43 % Fe
Phosphorus 11.99 % P
Hydrogen 2.93 % H
Oxygen 52.65 % O
Empirical Formula:
Fe3+Fe3+2(PO4)2(OH)3·6(H2O)
Environment:
Secondary phosphate mineral.
IMA Status:
Approved IMA
Locality:
Blaton, Belgium.
Name Origin:
Named for its composition and for Hugo Strunz (1910-), mineralogist, Berlin, who authored the Strunz system of mineral classification.
Physical Properties:
Cleavage:
[???] Good
Color:
brownish yellow or light yellow.
Density:
2.38 - 2.5, Average = 2.44
Diaphaniety:
Translucent
Habits:
Acicular - Occurs as needle-like crystals., Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
light yellow
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