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Marcasite derives its name from the Arabic word for pyrite, and is a common and an attractive mineral use in jewelry making and in other applications. The two minerals, marcasite and pyrite, are often confused due to their similar characteristics. Marcasite is a polymorph of pyrite which means that it has the same chemistry as pyrite but a different structure and, therefore, different symmetry and crystal shapes.
Marcasite has a unique silvery-black, almost gun-metal appearance that is highly prized in jewelry applications.