doubly refractive

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• Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …   Wikipedia

• double refraction — Optics. the separation of a ray of light into two unequally refracted, plane polarized rays of orthogonal polarizations, occurring in crystals in which the velocity of light rays is not the same in all directions. Also called birefringence. [1870 …   Universalium

• Lipid — Another word for fat. (Please see the various meanings of Fat.) A lipid is more formally defined as a substance such as a fat, oil or wax that dissolves in alcohol but not in water. Lipids contain carbon, hydrogen and oxygen but have far less… …   Medical dictionary

• disdiaclast — A doubly refractive element in striated muscular tissue. [G. dis, twice, + dia, through, + klastos, broken] * * * dis·di·a·clast (dis diґə klast) [dis 2 + dia + clast] any of the doubly refracting elements of the contractile substance of… …   Medical dictionary

• Malayaite — General Category Silicate mineral Chemical formula CaSnO[SiO4] Crystal symmetry Monoclinic prismatic (2/m) Unit cell a = 7.15 Å, b = 8.90 Å, c …   Wikipedia

• Infusoria — is a collective term for minute aquatic creatures like ciliates, euglenoids, protozoa, and unicellular algae that exist in freshwater ponds. In modern formal classifications the term is considered obsolete; and the microorganisms previously… …   Wikipedia

• marble — marbler, n. /mahr beuhl/, n., adj., v., marbled, marbling. n. 1. metamorphosed limestone, consisting chiefly of recrystallized calcite or dolomite, capable of taking a high polish, occurring in a wide range of colors and variegations and used in… …   Universalium

• Marble — /mahr beuhl/, n. Alice, 1913 90, U.S. tennis player. * * * Granular limestone or dolomite that has recrystallized under the influence of heat, pressure, and aqueous solutions. The main mineral in marble is calcite. Commercially, marble includes… …   Universalium

• paste — /payst/, n., v., pasted, pasting. n. 1. a mixture of flour and water, often with starch or the like, used for causing paper or other material to adhere to something. 2. any soft, smooth, and plastic material or preparation. 3. dough, esp. when… …   Universalium

• birefractive — bi·re·frac·tive .bī ri frak tiv adj having or characterized by birefringence: BIREFRINGENT * * * bi·re·frac·tive (bi″re frakґtiv) doubly refractive …   Medical dictionary

• birefringent — adj. doubly refractive, refracting twice (Optics) …   English contemporary dictionary