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Formula: Cu5O2(SeO3)2Cl2
Selenite, monoclinic paramorph of
geogbokiite that is also monoclinic
Crystal System: Monoclinic
Specific gravity: 4.70 calculated
Hardness: 3 to 4
Colour: Green
Environments
Although parageorgbokiite was approved in 2006, to date (October 2022) it has been reported only from the type localty.
Localities
The type locality, the second scoria cone, Northern Breakthrough, Great Fissure eruption, Tolbachik volcano, Kamchatka Krai,
Russia, is a volcanic fumarole whose temperature of formation is estimated to have been 400–625°C. Parageorgbokiite was
found as green, transparent plates up to 0.1 mm in size and in close intergrowths with
cotunnite and other copper selenite chlorides
ilinskite, chloromenite,
burnsite and allochalcoselite.
Other associates include tolbachite, sofiite,
melanothallite,
hydrokenoralstonite, gold,
euchlorine and chalcocyanite
(CM 45.929-934, Mindat).
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