Hagstromite
Hagstromite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Pb₈Cu²⁺(Te⁶⁺O₆)₂(CO₃)Cl₄.
It crystallizes in the orthorhombic crystal system (space group Ibam).
Key properties: Mohs hardness 2–3; specific gravity 7.038; Very pale yellow-green streak; Adamantine to silky luster; optically biaxial.
IMA symbol Hgs, IMA status: approved, named in 2020.
A secondary, oxidation zone mineral likely produced through oxidation of earlier tellurides, chalcopyrite, and galena.
It is found associated with Cerussite, fuettererite, thorneite (holotype); caledonite, diaboleite, timroseite (cotype).
The mineral was named to honor John P. Hagstrom (b. 1953) of Las Vegas, Nevada, USA, a mineral collector who in recent years focused on deposits in the Goodsprings district, Nevada.