pyrargyrite
noun
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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