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Formula: Cu9O2(VO4)4Cl2
Anhydrous vanadate
Crystal System: Triclinic
Specific gravity: 4.86 calculated
Hardness: 3½
Streak: Reddish black
Colour: Black
Common impurities: Mo,Zn
Environments
Yaroshevskite is a relatively new mineral, approved in 2012 and to date (August 2025) reported only from the
Tolbachik Volcanic Field.
Localities
At the type locality, the Yadovitaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption,
Tolbachik Volcanic field, Milkovsky District, Kamchatka Krai, Russia, yaroshevskite occurs in sublimates
collected from the fumarole at a temperature of up to 340°C. It is associated with
euchlorine, fedotovite,
hematite, tenorite,
lyonsite, melanothallite,
atlasovite, kamchatkite and
secondary
avdoninite, belloite and
chalcanthite. Yaroshevskite forms isolated prismatic crystals,
up to 0.1 x 0.15 x 0.3 mm3 in size, on the surface of
euchlorine crusts
(MM 77.1.107-116).
Yaroshevskite from the Yadovitaya Fumarole -
Image
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