Telluroperite
Telluroperite is an IMA-recognized mineral species in the halide class, with the chemical formula Pb(Te₀.₅Pb₀.₅)O₂Cl.
It crystallizes in the orthorhombic crystal system (space group Bmmb). It is a member of the Nadorite structural group.
Key properties: Mohs hardness 2–3; specific gravity 7.323; Pale bluish green streak; Adamantine luster; optically biaxial.
IMA symbol Tpr, IMA status: approved, named in 2009.
A secondary phase on fracture surfaces and in small vugs in quartz veins. Formed from the partial oxidation of primary sulfides (e.g., galena) and tellurides (e.g., hessite) during or following brecciation of the quartz veins.
It is found associated with Acanthite, bromine-rich chlorargyrite, caledonite, cerussite, galena, goethite, linarite.
Indicates the structural analogy to perite with essential tellurium in the composition.