Hübnerite

Hubnerite named after German mineralologist, Adolf Huebner. Hubnerite chemical formula: MnWO4. Has a molecular weight of 302.79 gm. manganese makes up 18.14% of chemical composition, tungsten: 60.72%, Oxygen: 21.14%. cleavage:[010] Perfect color: Brown, reddish brown, brownish black density: 7.15 fracture: brittle hardness: 4.5-between flourite and apatite luster: submetallic streak: red-brown diaphaniely:Transparent to translucent crystalline structure: monoclinic-prismatic