pyrargyrite
Py*rar"gy*rite, n. Etym: [Gr. (Min.) Defn: 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.
Py*rar"gy*rite, n. Etym: [Gr. (Min.) Defn: 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.