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Formula: CsKCu5O(SO4)5
Sulphate, cesium-bearing mineral
Crystal System: Triclinic
Specific gravity: 3.59 calculated
Colour: Light green to green
Environments
Cesiodymite is a new mineral, approved in 2016 and to date (September 2022), reported only from the type locality.
Localities
At the type locality, the Arsenatnaya fumarole, Second scoria cone, Northern Breakthrough, Great Fissure eruption.
Tolbachik volcano, Kamchatka Krai, Russia, cesiodymiteoccurs in the fumerole as coarse tabular or prismatic crystals
or grains up to 0.3 mm. Associated minerals include euchlorine,
chalcocyanite,
alumoklyuchevskite,
anglesite, fedotovite,
wulffite, langbeinite,
aphthitalite, steklite,
hematite and cryptochalcite
(Mindat).
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