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By Anne Marie Helmenstine, Ph.D.
Natural arsenic with quartz and calcite, from Ste. Marie-aux-mines, Alsace, France. Specimen is at the Natural History Museum, London. Pure arsenic is found in many forms, or allotropes, including yellow, black, and gray.
Definition: Arsenic is the name for the element with atomic number 33 and is represented by the symbol As.
It is a member of the metalloid group.
Anne Marie Helmenstine, Ph.D.
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