Hypertext Webster Gateway: "Cerargyrite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Cerargyrite \Ce*rar"gy*rite\, n. [Gr. ? horn + ? 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).
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