arsenopyrite

noun ar·se·no·py·rite \ˌär-sə-nō-ˈpī-ˌrīt\

Definition of ARSENOPYRITE

: a silver-white mineral consisting of a combined sulfide and arsenide of iron that occurs in prismatic orthorhombic crystals or in masses or grains and that is the principal source of arsenic

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First Known Use of ARSENOPYRITE

1868

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Britannica.com: Encyclopedia article about "arsenopyrite"

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