Graftonite
Graftonite is an iron(II), manganese, calcium phosphate mineral with formula: (Fe2+,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.
| Graftonite | |
|---|---|
 Graftonite with Triphylite Iron manganese calcium phosphate Palermo Mine, North Groton, New Hampshire | |
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) | (Fe2+,Mn,Ca)3(PO4)2 |
| Strunz classification | 8.AB.20 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/c |
It was first described from its type locality of Melvin Mountain in the town of Grafton, in Grafton County, New Hampshire.
References
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