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Formula: (K2Pb)Cu4O2(SO4)4
Sulphate
Specific gravity: 3.790 calculated
Colour: Black
Environments
Eleomelanite is a relatively new mineral, approved in 2019, and to date (March 2022) only reported 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, eleomelanite is associated with
euchlorine, fedotovite,
wulffite, chalcocyanite,
dolerophanite, dravertite,
hermannjahnite,
alumoklyuchevskite,
klyuchevskite, piypite,
cryptochalcite, cesiodymite,
anglesite, langbeinite,
calciolangbeinite,
metathénardite,
belomarinaite, aphthitalite,
krasheninnikovite, steklite,
anhydrite, hematite,
tenorite, sanidine,
sylvite, halite,
lammerite, urusovite and
gold. Eleomelanite occurs as interrupted crusts, up to 6 mm across and up to
0.3 mm thick, consisting of equant, prismatic, or tabular crystals or grains up to 0.3 mm.
The eleomelanite was recovered at a depth of 60 to 80 cm from the surface. The temperature was about
350oC. This part of the Arsenatnaya fumarole is strongly enriched in alkali and
copper sulphates
(CM 58.5.625-636).
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