vitreous sand

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• Vitreous quartzite — is rock type primarily made up of fine grained quartz sand metamorphosed to a glassy brittle light colored siliceous unit.One of three rock type definitions that were first applied in the Coeur d’Alene Mining District to the Revett Formation… …   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

• Garnet — For other uses, see Garnet (disambiguation). Garnet General Category Nesosilicate Chemical …   Wikipedia

• silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… …   Universalium

• body — 1. The head, neck, trunk, and extremities. The human b., consisting of head (caput), neck (collum), trunk (truncus), and limbs (membra). 2. The material part of a human, as distinguished from the …   Medical dictionary

• Glass — This article is about the material. For other uses, see Glass (disambiguation). Moldavite, a natural glass formed by meteorite impact, from Besednice, Bohemia …   Wikipedia

• eye disease — Introduction  any of the diseases or disorders that affect the human eye (eye, human).       This article briefly describes the more common diseases of the eye and its associated structures, the methods used in examination and diagnosis, and the… …   Universalium

• List of dog diseases — This list of dog diseases is a continuously updated selection of diseases and other conditions found in the dog. Some of these diseases are unique to dogs or closely related species, while others are found in other animals, including humans. Not… …   Wikipedia

• Anglo-Saxon glass — has been found across England during archaeological excavations of both settlement and cemetery sites. Glass in the Anglo Saxon period was used in the manufacture of a range of objects including vessels, beads, windows and was even used in… …   Wikipedia

• stained glass — stained glass, adj. glass that has been colored, enameled, painted, or stained, esp. by having pigments baked onto its surface or by having various metallic oxides fused into it, as used in church windows, decorative lampshades, etc. [1785 95] *… …   Universalium

• Fused quartz — A sphere manufactured by NASA out of fused quartz for use in a gyroscope in the Gravity Probe B experiment. It is one of the most accurate spheres ever created by humans, differing in shape from a perfect sphere by no more than 40 atoms of… …   Wikipedia