pīˈrärjəˌrīt, pə̇ˈr- noun
( -s )
Etymology: German pyrargyrit, from pyr- + argyr- + -it -ite
: a silver antimony sulfide Ag 3 SbS 3 that is isomorphous with proustite, occurs in rhombohedral crystals or massive, and has a dark-red or black color with a metallic adamantine luster — called also dark red silver ore, ruby silver