ˈärjənˌtīt noun
( -s )
Etymology: German argentit, from argent- + -it -ite
: a sectile mineral Ag 2 S consisting of native silver sulfide, having a metallic luster and dark lead-gray color, occurring in isometric crystals and in masses and coatings, and constituting a valuable ore of silver (hardness 2-2.5, specific gravity 7.20-7.36)