Graftonite

Not to be confused with Gratonite.

Graftonite is an iron(II), manganese, calcium phosphate mineral with the chemical 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)	(Fe^2+,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

• Mindat with location data
• Webmineral data