Wiktionary
graftonite
n. (context mineral English) A monoclinic-prismatic mineral containing calcium, iron, manganese, oxygen, and phosphorus.
Wikipedia
Graftonite
Graftonite is an iron(II), manganese, calcium phosphate mineral with formula: (Fe,Mn,Ca)(PO). 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.