Triploidite is an uncommon manganese iron phosphate mineral with formula: (Mn, Fe)2PO4OH.

[3] It typically occurs as a hydrothermal alteration product of primary phosphate minerals in granite pegmatites.

It occurs with triplite, lithiophilite, triphylite, eosphorite, dickinsonite and rhodochrosite.

[2][4] It forms a solid solution series with the iron rich wolfeite.

This article about a specific phosphate mineral is a stub.