Tenorite

IMA formula: CuO

Crystallography: Monoclinic. C2/c. a = 4.66(2) Å, b = 3.04(2) Å, c = 5.09(2) Å, β = 99.5(5)°. Z = 4.

Specimen #273. Tenorite. Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia. FOV 6.5 mm.

Specimen #274. Tenorite. Mount Vesuvius, Metropolitan City of Naples, Campania, Italy. FOV 7.5 mm.