crossed polars

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• Atheneite — is a rare metallic compound commonly associated with palladium–gold deposits. It was discovered in 1974 by A.M. Clark, A.J. Criddle, and E.E. Fejer in the Minas Gerais mine in the town of Itabira, Brazil (Clark, 1974). Atheneite was also found in …   Wikipedia

• interference colors —    Colors produced by the interference of two out or phase rays of white light when a birefringence material is observed at a nonextinction position between crossed polars. The retardation at a particular point in a birefringent fiber may be… …   Forensic science glossary

• Christite — General Category Sulfosalt mineral Chemical formula TlHgAsS3 Strunz classification 02.HD.15 Crystal symmetry Monoclinic …   Wikipedia