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Formula: Cu3O(MoO4)(SO4)
Molybdate-sulphate
Crystal System: Orthorhombic
Specific gravity: 4.32 calculated
Hardness: 4 to 4½
Streak: Light yellow
Colour: Olive-green
Luminescence: Not fluorescent under UV
Environments
Vergasovaite is a rare sublimation product in fumeroles. Although it was approved in 1998, to date (June 2024) it
has been reported only from the Tolbachik Volcano; it may transform into
cupromolybdite
(AM 109.3.471–481).
Localities
At the type locality, the Treschina fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption,
Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, vergasovaite occurs on encrustations of
sulphates in fumaroles. Associated minerals are chalcocyanite,
dolerophanite, euchlorine,
fedotovite, tenorite,
copper-bearing anglesite and
native gold
(AM 85.264-265).
Vergasovite from the Tolbachik Volcanic field -
Image
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