Klyuchevskite

klyuchevskite

kamchatkite

ponomarevite

tolbachite

Images

Formula: K3Cu3Fe3+O2(SO4)4
Anhydrous sulphate
Specific gravity: 3.00 to 3.15
Hardness: 3½
Streak: Pale green
Colour: Dark green to olive-green
Solubility: Readily soluble in water and in weak acid (1:20)
Common impurities: Pb
Environments

Fumeroles

Although klyuchevskite was approved as long ago as 1987, to date (March 2022) it has been reported only from the type locality. It hydrates in air in one week, and is stable in air up to 625°C (AM 75.1211-1212)

Localities

At the type locality, the Great Fissure eruption, Tolbachik volcano, Kamchatka Krai, Russia, klyuchevskite occurs in cavities in volcanic fumaroles, associated with alarsite, fedotovite, lammerite, nabokoite, atlasovite, langbeinite, ponomarevite, tolbachite, kamchatkite, hematite and tenorite (HOM). The klyuchevskite occurs as crystals in orientated aggregates, acicular, up to 0.1 mm long and not thicker than 0.01 mm, in cavities and fissures in massive sublimates composed of kamchatkite, ponomarevite and hematite (AM 75.1211-1212).

Back to Minerals