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Tungstite

Year of discovery: 1868 (Lane's mine, USA), 1916 (Japan)

Locality list: 20 localities of tungstite

• WO₃,H₂O
• [W⁶⁺][O₃]^6-,H₂O

• Class: Oxide - Hydrate
• Insoluble in: HCl
• Formed on dehydration of Hydrotungstite.
• Formed by alteration of Scheelite.

• W => Mo: Sidwillite

• H₂O => 0.5H₂O: Hydrokenoelsmoreite
• H₂O => 2H₂O: Meymacite, Hydrotungstite

• Color: Yellow, Yellowish green, Brighter with an orange tint than Hydrotungstite and Hydrokenoelsmoreite.
• Streak: Yellow
• Luster: Resinous
• Diaphaneity: Transparent

• Cleavage: Perfect on {001} (1 plane), Imperfect on {110} (2 planes)
• Hardness: 2.5
• Density: 5.5

• System: Orthorhombic
• Group: mmm, Pmnb
• Lattice: a=5.3, b=10.7, c=5.1