cerargyrite
Ce*rar"gy*rite, n. Etym: [Gr. (Min.) Defn: Native silver chloride, a mineral of a white to pale yellow or gray color, darkening on exposure to the light. It may be cut by a knife, like lead or horn (hence called horn silver).
Ce*rar"gy*rite, n. Etym: [Gr. (Min.) Defn: Native silver chloride, a mineral of a white to pale yellow or gray color, darkening on exposure to the light. It may be cut by a knife, like lead or horn (hence called horn silver).