zincite

{{Infobox mineral | name = Zincite | category = Oxide mineral | boxwidth = | boxbgcolor = | image = File:Zincite from Arizona.jpg | imagesize = 260px | caption = Crystal blades of zincite | formula = (Zn,Mn)O | IMAsymbol = Znc | strunz = 4.AB.20 | dana = 04.02.02.01 | molweight = | color = Orange, yellow-orange to deep red, red, rarely yellow, rarely green and colorless to white | habit = Disseminated – occurs in small, distinct particles dispersed in matrix. | system = Hexagonal | class = Dihexagonal pyramidal (6mm) H-M symbol: (6mm) | symmetry = P63mc | twinning = On {0001} | cleavage = On {100}, perfect; parting on {000} | fracture = Conchoidal | tenacity = Brittle | mohs = 4 | luster = Subadamantine to resinous | refractive = nω = 2.013, nε = 2.029 | opticalprop = Uniaxial (+) | birefringence = δ = 0.016 | pleochroism = | streak = Yellowish orange | diaphaneity = Translucent, transparent in thin fragments | gravity = 5.64–5.68 | melt = | fusibility = | diagnostic = | solubility = | other = | references = }}

Zincite is the mineral form of zinc oxide (ZnO). Its crystal form is rare in nature; a notable exception to this is at the Franklin and Sterling Hill Mines in New Jersey, an area also famed for its many fluorescent minerals. It has a hexagonal crystal structure and a color that depends on the presence of impurities. The zincite found at the Franklin Furnace is red-colored, mostly due to iron and manganese dopants, and associated with willemite and franklinite.