Specific gravity: 3.205 measured, 3.09 calculated
Streak: Pale grass-green
Colour: Emerald-green to grass-green
Solubility: Soluble in weak nitric acid, unstable in air
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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