Category Mineral Strunz classification 4.FJ.10 Space group Pmnb | Formula
(repeating unit) WO3·H2O Crystal system Orthorhombic | |
 | ||
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) | ||
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 1868 for an occurrence near Trumbull, Connecticut at the Hubbard Tungsten Mine at Long Hill.
References
Tungstite Wikipedia(Text) CC BY-SA