kamiokite

{{Infobox mineral | name = Kamiokite | category = Oxide minerals | boxwidth = | boxbgcolor = | image = Kamiokite.jpg | imagesize = | caption = Grey crystal aggregates of the very rare molybdenum mineral kamiokite from Mohawk Mine, Keweenaw, Michigan, United States of America. | formula = Fe2Mo3O8 | IMAsymbol = Kmk | molweight = 527.5 g/mol | strunz = 4.CB.40 | system = Hexagonal | class = Dihexagonal pyramidal (6mm) H-M symbol: (6mm) | symmetry = P63mc | unit cell = a = 5.782, b = 5.782 c = 10.053 [Å]; Z = 2 | color = black, gray | habit = tabular | twinning = none | cleavage = perfect {0001} | fracture = even | tenacity = | mohs = 4.5 | luster = metallic, sub-metallic | refractive = | opticalprop = anisotropic, uniaxial negative | birefringence = | pleochroism = distinct, gray to dark greenish gray | streak = black | gravity = | density = measured= 5.96 g/cm3 ; calculated= 6.02 g/cm3 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = opaque | other = Rotation tints of brownish yellow | references = }}

Kamiokite is an iron-molybdenum oxide mineral with the chemical formula Fe2Mo3O8. The name kamiokite is derived from the locality, the Kamioka mine in Gifu Prefecture, Japan, where this mineral was first discovered in 1975.