pyrargyrite

/P AY1 R AA0 R JH IH0 R AY0 T/
noun
  1. 1

    A sulfosalt mineral used as a silver ore; it is dark red or black in color with a metallic adamantine luster, a sulfide of antimony and silver, Ag3SbS3, and occurs in rhombohedral crystals.

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Source: https://en.wiktionary.org/wiki/pyrargyrite