Source : Webster's Revised Unabridged Dictionary (1913)

Pyrargyrite \Py*rar"gy*rite\, n. [Gr. ? fire + ? silver.] (Min.)
   Ruby silver; 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 color with a metallic
   adamantine luster.