Thorneite
Thorneite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Pb₆(Te₂O₁₀)(CO₃)Cl₂(H₂O).
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 2; specific gravity 6.79; Pale yellow streak; Adamantine luster; optically biaxial.
IMA symbol Tne, 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, cerussite, gold, hessite, iodargyrite, khinite, wulfenite, housleyite, markcooperite, ottoite.
The mineral was named to honor avid field collector, Brent Thorne (b. 1951) of Bountiful, Utah, the discoverer of the mineral.