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Formula: Au3Se4Te6
Telluride, gold- and
selenium- bearing mineral, forms a series with
tolstykhite
Crystal system: Triclinic
Specific gravity: 7.967 calculated for the empirical formula
Streak: Grey for synthetic material
Colour: Grey in reflected light
Environments
Maletoyvayamite is a relatively new mineral, approved in 2019.
Localities
At the type locality, the Gaching occurrence, Maletoyvayam ore field, Karaginsky District, Koryak Okrug,
Krai, Russia, maletoyvayamite was discovered in a heavy-mineral concentrate from the occurrence. It forms
anhedral grains, 10 to 50 μm in size, and is found in intergrowths with
native gold, gold the
telluride calaverite,
unnamed phases (AuSe, Au2TeSe and Au oxide), native tellurium,
the sulfosalts tennantite,
tetrahedrite,
goldfieldite and
watanabeite and
supergene
tripuhyite
(MM 84.1.117-123).
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