Hübnerite

Hübnerite is a mineral consisting of Manganese tungstate (chemical formula: MnWO₄).

• Molecular weight of 302.79 g/mol. manganese makes up 18.14% of chemical composition, tungsten: 60.72%, oxygen: 21.14%.

• Named after German mineralologist, Adolf Huebner.
• cleavage:[010] Perfect.
• color: Brown, reddish brown, brownish black.
• density: 7.15 g/cm³
• fracture: brittle.
• Mohs hardness: 4.5-between fluorite and apatite.
• luster: submetallic.
• streak: red-brown.
• diaphaniety:Transparent to translucent.
• crystalline structure: monoclinic-prismatic.

File:Http://www.fabreminerals.com/specimens/s images28/FR56m.jpg==External links==

• mineral galleries
• webmineral.com