quartz wedge

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• quartz wedge — A thin wedge of quartz which provides a means of superposing any required thickness of quartz on a mineral section being viewed under a polarming microscope, the wedge being cut parallel to the optic axis of a prism of quartz crystal. It enables… …   Dictionary of automotive terms

• quartz wedge — noun : a piece of quartz cut in a thin wedge and used in the optical determination of minerals and in the study of polarized light …   Useful english dictionary

• compensator, quartz wedge —    A wedge, cut from quartz, having continuously variable retardation extending over several orders of interference colors (usually 3 to 7) …   Forensic science glossary

• q wedge — noun ( s) Usage: usually capitalized Q : quartz wedge …   Useful english dictionary

• Depolarizer (optics) — A depolarizer or depolariser is an optical device used to scramble the polarization of light. An ideal depolarizer would output randomly polarized light whatever its input, but all practical depolarizers produce pseudo random output polarization …   Wikipedia

• Optical mineralogy — A petrographic microscope, which is an optical microscope fitted with cross polarizing lenses, a conoscopic lens, and compensators (plates of anisotropic materials; gypsum plates and quartz wedges are common), for crystallographic analysis.… …   Wikipedia

• industrial glass — Introduction       solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… …   Universalium

• Jacques Babinet — (March 5 1794 in Lusignan, France ndash; October 21 1872 in Paris, France) was a French physicist, mathematician, and astronomer who is best known for his contributions to optics. Babinet started his studies at the Lycée Napoléon, but was… …   Wikipedia

• Jacques Babinet —     Jacques Babinet     † Catholic Encyclopedia ► Jacques Babinet     French physicist, born at Lusignan, Vienne, 5 March, 1794; died at Paris, 21 October, 1872. He began his studies at the Lycée Napoléon. There he became a pupil of Binet, whose… …   Catholic encyclopedia

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• Geology of Tasmania — Tasmania has a varied geological history, with the world s biggest exposure of diabase, or dolerite. Rocks from the Neoproterozoic, Paleozoic and Mesozoic time periods appear. It is one of the few southern hemisphere areas glaciated during the… …   Wikipedia