Tavagnascoite
Tavagnascoite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Bi₄O₄(SO₄)(OH)₂.
It crystallizes in the orthorhombic crystal system (space group Pca2_1). It is a member of the Klebelsbergite structural group.
Key properties: specific gravity 6.505; Silky luster.
IMA symbol Tvg, IMA status: approved, named in 2014.
Within vugs in hydrothermal veins, in association with secondary Bi-minerals from the alteration of a bismuthinite ± Bi-sulfosalt assemblage.
It is found associated with Quartz, Bi-oxides and sulfates.
The name refers to the district that produced the first specimens.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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