Lehmannite

IMA formula: Na₁₈Cu₁₂TiO₈(AsO₄)₈FCl₅

Specimen #222. Lehmannite. Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough (North Breach), Great Fissure eruption (Main Fracture), Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia. FOV 4.6 mm.