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Alluaudite is a relatively common alkaline manganese iron phosphate mineral with formula (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3. It occurs as metasomatic replacement in granitic pegmatites and within phosphatic nodules in shales.

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Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
 IMA Status:
Approved IMA 1976
Physical Properties:
[100] Good, [010] Good
brownish yellow, green, yellow, or black.
3.52 - 3.584, Average = 3.55
Subtranslucent to Opaque
5-5.5 - Apatite-Knife Blade
brownish yellow
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