Specific gravity: 2.78
Colour: Red with a gold tint
Solubility: Soluble in cold water
Ponomarevite is a very rare mineral, to date (September 2021) reported only from the Tolbachik volcano.
At the type locality, the First scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, ponomarevite occurs as a fracture filling and in fumaroles, deposited from 280oC to 400oC. Associated minerals include halite, sylvite, tenorite, tolbachite, dolerophanite, piypite, chalcocyanite, cotunnite, sofiite, klyuchevskite and kamchatkite. The ponomarevite occurs as a cement and as a crust, 1 to 2 cm thick (AM 75.709, HOM, Dana).
Ponomarevite is unstable in air, altering slowly to mitscherlichite (AM 75.709).
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