pyr·ar·gy·rite | \ pīˈrärjəˌrīt , pə̇ˈr- \
plural -s

Definition of pyrargyrite 

: a silver antimony sulfide Ag3SbS3 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

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History and Etymology for pyrargyrite

German pyrargyrit, from pyr- + argyr- + -it -ite

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