Tungstite

  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.

Additional recommended knowledge

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Essential Laboratory Skills Guide

It was first described in 1868 for an occurrence near Trumbull, Connecticut.

References

• Mindat with location data
• Webmineral