Graftonite

  Graftonite is an iron(II), manganese, calcium phosphate mineral with formula: (Fe⁺⁺,Mn,Ca)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.

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It was first described from its type locality of Melvin Mountain, Grafton, Grafton County, New Hampshire.

References

• Mindat with location data
• Webmineral data