Arsenopyrite
Pronunciation : Ar`sen*o*pyr"ite
Part of Speech : n.
Etymology : [Arsenic + pyrite.] (Min.)
Definition : Defn: A mineral of a tin-white color and metallic luster, containing arsenic, sulphur, and iron; -- also called arsenical pyrites and mispickel.
Source : Webster's Unabridged Dictionary, 1913