Chemistry:Graftonite

From HandWiki
Graftonite
Graftonite with Triphylite Iron manganese calcium phosphate Palermo Mine, North Groton, New Hampshire 2863.jpg
Graftonite with Triphylite Iron manganese calcium phosphate Palermo Mine, North Groton, New Hampshire
General
CategoryPhosphate minerals
Formula
(repeating unit)
(Fe2+
,Mn,Ca)
3
(PO
4
)
2
Strunz classification8.AB.20
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/c

Graftonite is an iron(II), manganese, calcium phosphate mineral with the chemical formula (Fe2+
,Mn,Ca)
3
(PO
4
)
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.

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

References