Quartz-rock
81rock crystal — transparent quartz, esp. when colorless. [1660 70] * * * Transparent variety of the silica mineral quartz that is valued for its clarity and total lack of colour or flaws. Rock crystal formerly was used extensively as a gemstone, but it has been… …
82quartz — quartzose /kwawrt sohs/, quartzous /kwawrt seuhs/, adj. /kwawrts/, n. one of the commonest minerals, silicon dioxide, SiO2, having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony …
83Rock crystal — Crystal Crys tal (kr[i^]s tal), n. [OE. cristal, F. cristal, L. crystallum crystal, ice, fr. Gr. kry stallos, fr. kry os icy cold, frost; cf. AS. crystalla, fr. L. crystallum; prob. akin to E. crust. See {Crust}, {Raw}.] 1. (Chem. & Min.) The… …
84rock crystal — Crystal Crys tal (kr[i^]s tal), n. [OE. cristal, F. cristal, L. crystallum crystal, ice, fr. Gr. kry stallos, fr. kry os icy cold, frost; cf. AS. crystalla, fr. L. crystallum; prob. akin to E. crust. See {Crust}, {Raw}.] 1. (Chem. & Min.) The… …
85Quartz Mountain — Infobox Mountain Name = Quartz Mountain Elevation = convert|2040|ft|m|0 Location = Oklahoma, USA Range = Wichita Mountains Prominence = Topographic [http://www.wichitamountains.org/quartzimg/quartzmap1b.jpgTopo map] ] Quartz Mountain is located… …
86quartz glass — noun colorless glass made of almost pure silica • Syn: ↑quartz, ↑vitreous silica, ↑lechatelierite, ↑crystal • Derivationally related forms: ↑crystallize (for: ↑crystal), ↑ …
87quartz — (Roget s IV) n. Types of quartz include: amethyst, false topaz, rock crystal, rose quartz, smoky quartz, bloodstone, agate, onyx, sardonyx, carnelian, chrysoprase, citrine, chalcedony, prase, flint, jasper; see also rock 1 …
88Quartz-dolerite — An intrusive rock, similar to dolerite, but with an excess of quartz. Dolerite is similar in composition to basalt, which is eruptive (from volcanoes), and gabbro, which is plutonic. The differing crystal sizes are due to the different rate of… …
89Rock cycle — rocks do not remain in equilibrium and are forced to change as they encounter new environments. The rock cycle is an illustration that explains how the 3 rock types are related to each other and how processes change from one type to another over… …
90Quartz latite — A quartz latite is a latite with a phenocryst modal composition containing 5 20% quartz. Above 20% quartz, the rock would be classified as a rhyolite …
