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Formula: Cu5O2(VO4)2.CuCl2
Vanadate, chlorine-bearing
mineral
Crystal System: Trigonal
Specific gravity: 3.54 measured, 4.01 calculated
Hardness: 4
Streak: Black
Colour: Black
Environments
Averievite was approved in 1995 but to date (March 2025) it has been reported only from the
Tolbachik volcano.
Localities
At the type locality, the Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, averievite
occurs as pseudohexagonal crystals, to 0.3 mm, in volcanic fumaroles, associated with
piypite,
alumoklyuchevskite,
fedotovite, alarsite,
nabokoite, tenorite,
lammerite and langbeinite
(HOM, Mindat).
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