1) Tungsten mineral 
Tungstite is a hydrous tungsten oxide mineral with formula: WO3·H2O. It is a secondary mineral formed by the weathering of other tungsten containing minerals. It crystallizes in the orthorhombic system in translucent yellow to yellow green masses. It is clay-like with Mohs hardness of 2.5 and a specific gravity of 5.5. It was first described in 1...
• (n.) The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.
Tungstite is the oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.
a yellow or yellowish-green mineral, tungsten trioxide, WO, usually occurring in a pulverulent form.