Manitobaite
Manitobaite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Na₁₆Mn²⁺₂₅Al₈(PO₄)₃₀.
It crystallizes in the monoclinic crystal system (space group Pc). It is a member of the Alluaudite-Manitobaite structural group.
Key properties: specific gravity 3.621; Colorless to very pale green or very pale greenish brown streak; Vitreous to resinous luster; optically biaxial.
IMA symbol Mtb, IMA status: approved, named in 2008.
A primary phase in phosphate pods in a zoned granitic pegmatite.
It is found associated with Interior-wall zone of the pegmatite: fluorapatite, chlorapatite, bobfergusonite, eosphorite, dickinsonite, triploidite, goyazite, perloffite, beusite.
The name refers to the province of Manitoba (Canada) in which the mineral was discovered.