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Noun: ruby silver
  1. A sulphide of arsenic and silver of a beautiful cochineal-red colour, occurring in rhombohedral crystals, and also massive
    - proustite
  2. Dark red silver ore; it is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black colour with a metallic adamantine lustre
    - pyrargyrite

Derived forms: ruby silvers