Tazieffite
Tazieffite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₂₀Cd₂(As,Bi)₂₂S₅₀Cl₁₀.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Vurroite structural group.
Key properties: specific gravity 6.07; Black streak; Metallic luster.
IMA symbol Tzf, IMA status: approved, named in 2008.
Forms as a sublimate at an active volcanic fumarole.
It is found associated with Greenockite, galena, mutnovskite, kudriavite, Cd-rich cannizzarite, pyrite, anhydrite, cristobalite.
The mineral was named to honor Haroun Tazieff (1914-1998), Belgian/French volcanologist, a pioneer in the field study of volcanoes who devoted his life to the study of volcanic gases.
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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