Tags: Chemical Substance, Mineral.

Graftonite is an iron(II) manganese calcium phosphate mineral with formula: (Fe2+MnCa)3(PO4)2. It forms lamellar to granular translucent brown to red-brown to pink monoclinic prismatic crystals. It has a vitreous luster with a Mohs hardness of 5 and a specific gravity of 3.67 to 3.7.It was first described from its type locality of Melvin Mountain in the town of Grafton in Grafton County New Hampshire.

Graftonite_with_Triphylite_Iron_manganese_calcium_phosphate_Palermo_Mine_North_Groton_New_Hampshire_2863.jpg

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