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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.
Additional recommended knowledge
It was first described from its type locality of Melvin Mountain, Grafton, Grafton County, New Hampshire.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Graftonite". A list of authors is available in Wikipedia.|