Formula: Au(Te1-xSex) (0.2 ≈ x ≤ 0.5)
Selenide of gold and tellurium
Specific gravity: 10.47 calculated
Gachingite is a new mineral, approved in 2021 and to date (June 2022) reported only from the type locality.
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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