Fedotovite

fedotovite

dolerophanite

chalcocyanite

tolbachite

Images

Formula: K2Cu3O(SO4)3
Anhydrous sulphate
Specific gravity: 3.205 measured, 3.09 calculated
Hardness: 2½
Streak: Pale grass-green
Colour: Emerald-green to grass-green
Solubility: Soluble in weak nitric acid, unstable in air
Environments

Fumeroles

Localities

At the type locality, the Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, fedotovite forms aggregates of poorly developed platy to micaceous crystals and fine-grained crusts 1 to 2 mm thick, in incrustations around fumaroles. Associated minerals include dolerophanite, chalcocyanite, tolbachite, piypite, melanothallite, tenorite, vergasovaite, euchlorine, alarsite, klyuchevskite, lammerite, nabokoite, atlasovite, langbeinite and hematite (AM 75.240-246, HOM).

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