Krennerite

Krennerite is an orthorhombic gold mineral in the structure. The formula is AuTe2, but specimen with gold substituted by up to 24% with silver Both of the chemically similar gold-silver tellurides, calaverite , are in the monoclinic crystal system, whereas krennerite is orthorhombic.

The color varies from silver-white to brass-yellow. It has a specific gravity of 2.5. It occurs in high temperature, hydrothermal environments.

Krennerite was discovered in 1878 near the village of Săcărâmb, and first described by the Hungarian Joseph Krenner