Cerargyrite \Ce*rar"gy*rite\ (s[-e]*r[aum]r"j[y^]*r[imac]t), n.
[Gr. ke`ras horn + 'a`rgyros silver.] (Min.)
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}).
[1913 Webster]