Iron arsenosulfide

Description

Silvery gray crystals or masses. Iron arsenosulfide, or arsenopyrite, is the most common ore of Arsenic. It is found in Mexico (Mapimí), Sweden (Tunaberg) and the U.S. (Montana). As the ore weathers the sulfides are converted to oxides and the stone takes on a tarnished appearance.

Synonyms and Related Terms

iron arsenopyrite; pyrite; arsenical pyrite; arsenopyrite; white metal; mispickel

Physical and Chemical Properties

Composition	FeSAs

Resources and Citations

• Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985

• Encyclopedia Britannica, http://www.britannica.com Comment: "arsenopyrite" [Accessed October 23, 2001].