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Formula: AuSe
Selenide of gold
Crystal System: Monoclinic
Specific gravity: 9.750 calculated
Streak: Grey
Colour: Bluish grey
Environments
Auroselenide is a new mineral, approved in 2022 and to date (October 2025) reported only from the type locality.
Localities
At the type locality, the Gaching occurrence, Maletoyvayam ore field, Karaginsky District, Koryak Okrug, Kamchatka
Krai, Russia, auroselenide occurs as anhedral grains up to 0.05 × 0.02 mm and as intergrowths up to 0.06 mm
with
maletoyvayamite–tolstykhite
series minerals, enclosed in native gold. Other associated minerals include
pyrite, calaverite,
fischesserite, gachingite,
tetrahedrite-group minerals
stibiogoldfieldite, its
arsenic analogue,
tennantite-(Cu) and
tetrahedrite-(Zn)],
tripuhyite, minerals of the
famatinite–luzonite and
selenium–tellurium series,
paraguanajuatite,
petrovskaite, součekite and
tiemannite
(MM 87.2.284-291).
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