arsenopyrite

[ ahr-suh-noh-pahy-rahyt, ahr-sen-uh- ]
/ ˌɑr sə noʊˈpaɪ raɪt, ɑrˌsɛn ə- /

noun

a common mineral, iron arsenic sulfide, FeAsS, occurring in silver-white to steel-gray crystals or masses: an ore of arsenic.
Also called mispickel.

Origin of arsenopyrite

First recorded in 1880–85; arseno- + pyrite

British Dictionary definitions for arsenopyrite

arsenopyrite
/ (ˌɑːsɪnəʊˈpaɪraɪt, ɑːˌsɛnə-) /

noun

a white or grey metallic mineral consisting of a sulphide of iron and arsenic that forms monoclinic crystals with an orthorhombic shape: an ore of arsenic. Formula: FeAsS Also called: mispickel