Urusovite

urusovite

ponomarevite

piypite

dolerophanite

Images

Formula: CuAlO(AsO4)
Arsenate
Specific gravity: 3.93 calculated
Hardness: 4
Streak: White
Colour: Light green
Luminescence: No fluorescence in UV
Solubility: Practically insoluble in water and alcohol
Environments

Fumeroles

Urusovite was approved in 1998, but to date (July 2022) it has been reported only from the 2nd scoria cone of the Tolbachik volcano, where it occurs in the Arsenatnaya fumarole, as well as the type locality, the Novaya fumerole.

Localities

At the type locality, the Novaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, urusovite has been found in a fumarole with a gas temperature of 410oC to 420oC at the time of collection. It occurs as light-green plates up to 0.4 mm across. Associated minerals are ponomarevite, piypite, sylvite, dolerophanite, euchlorine, tenorite, hematite and two unknown arsenic-bearing minerals (EJM 12.1041-1044).

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