What is "tungstite"

Tungstite \Tung"stite\, n. (Min.) The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.

n. (context mineralogy English) An orthorhombic hydrous tungsten oxide mineral formed by the weathering of other tungsten-containing minerals.

Tungstite is a hydrous tungsten oxide mineral with formula: W O· HO. 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 1868 for an occurrence near Trumbull, Connecticut at the Hubbard Tungsten Mine at Long Hill.