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Graftonite
Graftonite with Triphylite Iron manganese calcium phosphate Palermo Mine, North Groton, New Hampshire
General
Category	Phosphate minerals
Formula (repeating unit)	(Fe,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

Graftonite is an iron(II), manganese, calcium phosphate mineral with the chemical 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.

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

v t e Manganese minerals
Borates	Sussexite Tusionite
Carbonates	Ankerite Kutnohorite Rhodochrosite Manganoan calcite
Oxides	Simple Hausmannite Manganite Manganosite Nsutite Pyrolusite Mixed Birnessite Bixbyite Ferrocolumbite Ferrotantalite Galaxite Jacobsite Manganotantalite Psilomelane (calvonigrite) Romanèchite Tantalite Todorokite Umber
Phosphates	Childrenite Graftonite Lithiophilite Natrophilite Purpurite Triplite Triploidite Zanazziite
Silicates	Babingtonite Braunite Brownleeite Calderite Chloritoid Eudialyte Glaucochroite Jeffersonite Knebelite Ottrelite Piemontite Pyroxferroite Rhodonite Spessartine Sugilite Tephroite Zakharovite Zircophyllite
Sulfides	Alabandite Hauerite Rambergite
Other	Axinite (borosilicate) Geigerite (arsenate) Manganese nodule (various) Samsonite (sulfosalt) Zincobotryogen (sulfate) Wolframite (tungstate) Hübnerite (tungstate)
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