Arsenic found in nature, usually found in the form of compound additives arsenide or sulfide of copper, lead, silver and gold are not found in the form of a metal. Mainly found in the form of a mineral RC no pyrite (FeAsS) realgar (tetraarsenic, tetrasulfideAs4S4) and Orleans special Maine (arsenictrisulfide As2S3), or may be found in the form of oxide in water are often found in the form of arsenate (Arsenate) or ah arsenide. (Arsenite)
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