Alluaudite

General Information:
 Chemical Formula:
NaCaFe++(Mn,Fe++,Fe+++,Mg)2(PO4)3
 IMA Status:
Approved IMA 1976
Physical Properties:
 Cleavage:
[100] Good, [010] Good
 Color:
brownish yellow, green, yellow, or black.
 Density:
3.52 - 3.584, Average = 3.55
 Diaphaniety:
Subtranslucent to Opaque
 Hardness:
5-5.5 - Apatite-Knife Blade
 Streak:
brownish yellow
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