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Formula: Au(Te1-xSex) (0.2 ≈ x ≤ 0.5)
Selenide of gold and
tellurium
Crystal System: Orthorhombic
Specific gravity: 10.47 calculated
Environments
Metamorphic environments
Hydrothermal environments
Gachingite is a new mineral, approved in 2021 and to date (May 2023) reported only from the type locality.
Localities
At the type locality, the Gaching occurrence, Maletoyvayam ore field, Kamchatka Krai, Russia, gachingite forms
individual droplet-like grains of sizes from 2 to 10 μm included in native gold,
associated with calaverite,
maletoyvayamite, watanabeite and
gold-antimony oxides. The aggregates do not
exceed 100 μm in diameter.
The formation of gachingite requires an abundant source of gold and
selenium and a high oxidising environment. Gachingite is related to the
gold-bearing productive stage of ore mineralisation
(MM 86.2.205-213)
The deposit represents a quartz stockwork
hosted by the secondary
quartzites and intensely oxidized
quartz-alunite rocks
(Mindat).
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