Arsmirandite

arsmirandite

lehmannite

halite

rutile

Images

Formula: Na₁₈Cu₁₂Fe³⁺O₈(AsO₄)₈Cl₅
Arsenate
Crystal System: Monoclinic
Specific gravity: 3.715 calculated
Streak: Greyish green with an olive hue
Colour: Dark greyish green to olive-greenish black
Environments

Fumeroles

Arsmirandite is a relatively new mineral, approved in 2014 and to date (September 2023) reported only from the type locality.

Localities

At the type locality, the Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, arsmirandite occurs as a sublimate around the active volcanic fumarole. Associated minerals include lehmannite, hematite, sanidine, sylvite, halite, tenorite, cassiterite, rutile, and 40 other species (HOM).

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