Puninite

IMA formula: Na₂Cu₃O(SO₄)₃

Crystallography: Monoclinic. C2/c. a = 17.41(1) Å, b = 9.39(1) Å, c = 14.40(1) Å, β = 112.04(7)°. Z = 8.

Specimen #224. Puninite. Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia. FOV 3.2 mm.