Selenolaurite

selenolaurite

moncheite

osmium

ruthenium

Images

Formula: RuSe2
Selenide of ruthenium
Crystal system: Isometric
Specific gravity: 8.415 calculated
Streak: Black
Colour: Grey
Solubility: Insoluble in cool concentrated hydrochloric acid
Magnetism: Non-magnetic
Environments

Placer deposits

Selenolaurite is a new mineral, approved in and 2020 pending publication as of May 2025

Localities

At the type locality, Ingul gold-bearing placer, Nepryakhino, Chebarkulsky District, Chelyabinsk Oblast, Russia, selenolaurite was discovered in heavy mineral separates from the placer occurrence. At present (May 2025), there are fewer than 10 approved mineral species with site-defining Ru, and no other minerals with both Ru and Se. Selenolaurite type material consists of minute grains to about 20 μm occurring alongside selenium-rich moncheite within interstices in native osmium crystals (AM 110.5.830).
Associated minerals include moncheite, chromite, thorite, tantalite, magnetite, ilmenite, gold, amphibole supergroup minerals, hematite, almandine, pyrite, limonite, arsenopyrite, rutile, molybdenite, zircon, tourmaline, baryte, monazite group minerals and kyanite (Mindat).

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