from The Century Dictionary.
- noun A selenide of silver and lead, occurring rarely in cubical crystals, also granular, and in thin plates of iron-black color and brilliant metallic luster.
Sorry, no etymologies found.
"Well, sometimes selenium is found in combination with metals, in the form of selenides, the more important minerals of that kind being eucharite, crooksite, clausthalite, naumannite and zorgite --"
Mineralogical analysis shows that silver is contained, partly or fully, in the silver bearing minerals pyrargyrite, naumannite a directly cyanide soluble silver mineral and selenian miargyrite.