graftonite

{{Infobox mineral | name = Graftonite | boxwidth = | boxbgcolor = | image = Graftonite with Triphylite Iron manganese calcium phosphate Palermo Mine, North Groton, New Hampshire 2863.jpg | imagesize = | alt = | caption = Graftonite with Triphylite Iron manganese calcium phosphate Palermo Mine, North Groton, New Hampshire | category = Phosphate minerals | formula = {{chem2|(Fe^{2+},Mn,Ca)3(PO4)2}} | molweight = | strunz = 8.AB.20 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/c | unit cell = | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

Graftonite is an iron(II), manganese, calcium phosphate mineral with the chemical formula {{chem2|(Fe^{2+},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.