Tags: Chemical Substance, Mineral.

Alluaudite is a relatively common alkaline manganese iron phosphate mineral with formula (NaCa)Mn2+(Fe3+Mn2+Fe2+Mg)2(PO4)3 of secondary (metasomatic) origin related with granitic pegmatites mainly. Named by Alexis Damour in 1847 after François Alluaud (II) (1778–1866).

Alluaudite_2_Sodium_iron_manganese_phosphate_Pleasant_Valley_Mine_near_Fourmile_Custer_County_South_Dakota_2264Spp.jpg

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