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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
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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