Ar′sen‐o‐pyr″ite (�), n. [Arsenic + pyrite.] (Min.) A mineral of a tin-white color and metallic luster, containing arsenic, sulphur, and iron; — also called arsenical pyrites and mispickel.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.