Quartz Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque. [1913 Webster]

Note: The crystalline varieties include: amethyst, violet; citrine and false topaz, pale yellow; rock crystal, transparent and colorless or nearly so; rose quartz, rosecolored; smoky quartz, smoky brown. The chief crypto-crystalline varieties are: agate, a chalcedony in layers or clouded with different colors, including the onyx and sardonyx; carnelian and sard, red or flesh-colored chalcedony; chalcedony, nearly white, and waxy in luster; chrysoprase, an apple-green chalcedony; flint, hornstone, basanite, or touchstone, brown to black in color and compact in texture; heliotrope, green dotted with red; jasper, opaque, red yellow, or brown, colored by iron or ferruginous clay; prase, translucent and dull leek-green. Quartz is an essential constituent of granite, and abounds in rocks of all ages. It forms the rocks quartzite (quartz rock) and sandstone, and makes most of the sand of the seashore. [1913 Webster]

The Collaborative International Dictionary of English. 2000.


Look at other dictionaries:

  • quartz — [ kwarts ] n. m. • 1749; all. Quarz ♦ Forme cristalline commune de la silice (SiO2), appelée à l état pur cristal de roche; élément constitutif fréquent des roches cristallines (granites, rhyolithes, etc.), de certaines roches sédimentaires… …   Encyclopédie Universelle

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  • quartz — [kwo:ts US kwo:rts] n [U] [Date: 1700 1800; : German; Origin: quarz] a hard mineral substance that is used in making electronic watches and clocks ▪ quartz crystals ▪ a quartz watch …   Dictionary of contemporary English

  • Quartz — der; es, e <aus engl. quartz> engl. Schreibung von dt. Quarz (z. B. zur Kennzeichnung von quarzgesteuerten Uhren) …   Das große Fremdwörterbuch

  • quartz — (n.) 1756, from Ger. Quarz rock crystal, from M.H.G. twarc, probably from a W.Slavic source (Cf. Czech tvrdy, Polish twardy quartz ), from O.C.S. tvrudu hard …   Etymology dictionary

  • quartz — [kwôrts] n. [Ger quarz < ?] any of various crystallized forms of silica that are transparent, translucent, or colored, used in many ways, esp. as a gem or in making glass, lenses, or quartz crystals: see MOHS SCALE quartzose [kwôrts′ōs΄] adj …   English World dictionary

  • quartz — [ kwɔrts ] noun uncount a hard shiny stone often used inside electronic equipment and watches …   Usage of the words and phrases in modern English

  • quartz — ► NOUN ▪ a hard mineral consisting of silica, typically occurring as colourless or white hexagonal prisms. ORIGIN German Quarz, from Polish dialect kwardy, corresponding to Czech tvrdý hard …   English terms dictionary

  • Quartz — This article is about the mineral. For other uses, see Quartz (disambiguation). Quartz Quartz crystal cluster from Tibet General Category …   Wikipedia

  • quartz — 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 …   Universalium

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