Dark green globular aggregates of tungstibite crystals from the type locality (Clara Mine, Wolfach, Black Forest, Baden-Württemberg, Germany) and one of the only three localities known worldwide. Tungstibite is a very rare tungsten-antimony mineral. — Photo: David Hospital · CC BY-SA 4.0
Tungstibite
Tungstibite is an IMA-recognized mineral species in the tungstate class, with the chemical formula Sb₂WO₆.
It crystallizes in the orthorhombic crystal system.
Key properties: Mohs hardness 2; specific gravity 6.69; Green streak; Dull, may be pearly luster; optically biaxial.
IMA symbol Tsb, IMA status: approved, named in 1993.
Found in a hydrothermal polymetallic barite–fluorite deposit.
It is found associated with Cervantite, quartz, barite, fluorite, tetrahedrite–tennantite, chalcopyrite.
The name refers to TUNGsten and antimony, STIBium, in the composition.