Ziesite

IMA formula: Cu₂V⁵⁺₂O₇

Crystallography: Monoclinic. A2/a. a = 10.094(15) Å, b = 8.020(13) Å, c = 7.711(10) Å, β = 110.43(9)°. Z = 2.

Specimen #216. Ziesite. Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia. FOV 1.7 mm.