wolframite

{{Infobox mineral | name = Wolframite | category = Oxide minerals | boxwidth = | boxbgcolor = | image = Wolframiteportugal3.jpg | imagesize = 260px | caption = | formula = | strunz = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P2/c | unit cell = a = 4.77 Å, b = 5.73 Å c = 4.98 Å; β = 90.2°; Z = 2 | color = Grayish to brownish black | habit = Tabular to short prismatic crystals | twinning = | cleavage = Perfect {010} | fracture = Uneven to rough | mohs = 4–4.5 | luster = Submetallic to resinous | refractive = | opticalprop = | birefringence = | pleochroism = | streak = Reddish brown | gravity = 7–7.5 | density = | melt = | fusibility = 3–4 to magnetic globule | diagnostic = | solubility = | diaphaneity = Opaque | references = }}

Wolframite is an iron, manganese, and tungstate mineral with a chemical formula of that is the intermediate mineral between ferberite ( rich) and hübnerite ( rich). Along with scheelite, the wolframite series are the most important tungsten ore minerals. Wolframite is found in quartz veins and pegmatites associated with granitic intrusives. Associated minerals include cassiterite, scheelite, bismuth, quartz, pyrite, galena, sphalerite, and arsenopyrite.