Ponomarevite

ponomarevite

tolbachite

piypite

cotunnite

Images

Formula: K4Cu4OCl10
Oxyhalide
Specific gravity: 2.78
Hardness: 2½
Streak: Orange-red
Colour: Red with a gold tint
Solubility: Soluble in cold water
Environments

Fumeroles

Ponomarevite is a very rare mineral, to date (September 2021) reported only from the Tolbachik volcano.

Localities

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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