Brodtkorbite
Brodtkorbite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₂HgSe₂.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: Mohs hardness 2.5–3; specific gravity 7.77; Dark gray streak; Metallic luster; optically biaxial.
IMA symbol Bdk, IMA status: approved, named in 1999.
Uncommon in telethermal selenium-rich hydrothermal polymetallic deposits, in calcite veins in amphibolites, formed below 112 flC.
It is found associated with Berzelianite, tiemannite, umangite, clausthalite, eucairite, naumannite, hematite, calcite (Argentina); tiemannite, berzelianite, umangite, eucairite.
The mineral was named to honor Dr. Milka Kronegold de Brodtkorb (1932–), Professor at the Universities of Buenos Aires and La Plata, Argentina.