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Formula: Cu2+6Fe3+Bi3+O4(SO4)5.KCl
Anhydrous sulphate, forms an isomorphous series with nabokoite in which
Fe3+ and Bi3+ substitute for Cu and Te
Crystal System: Tetragonal
Specific gravity: 4.20 measured, 4.12 calculated
Hardness: 2 to 2½
Streak: Pale brown
Colour: Dark brown
Solubility: Insoluble in water, soluble in hydrochloric and nitric acids
Environments
Although atlasovite was approved in 1986, to date (September 2023) it has been reported only from the
Tolbachik volcano.
Localities
At the type locality, the Great Fissure eruption, Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai,
Russia, atlasovite occurs as tabular crystals; the crystals may consist predominantly of atlasovite,
or atlasovite may occur as zones within nabokoite
(AM 73.927-935).
At the Yadovitaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik Volcanic
field, Milkovsky District, Kamchatka Krai, Russia, yaroshevskite,
new in 2012, occurs in sublimates, associated with euchlorine,
fedotovite, hematite,
tenorite, lyonsite,
melanothallite, atlasovite,
kamchatkite and
secondary
avdoninite, belloite and
chalcanthite
(MM 77.1.107-116).
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