General Information:
Chemical Formula:
(NH4,K)(Fe+++,Al)2(PO4)2(OH)·2(H2O)
IMA Status:
Approved IMA 1986
Physical Properties:
Color:
brown.
Density:
2.71
Diaphaniety:
Transparent to Translucent
Hardness:
1-1.5 - Talc or a little harder
Luster:
Earthy (Dull)
Streak:
white
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