rock crystal

quartz; a transparent form of silicon dioxide (silica), SiO2; used for lenses.

Medical dictionary. 2011.

Look at other dictionaries:

  • Rock crystal — Rock Rock, n. [OF. roke, F. roche; cf. Armor. roc h, and AS. rocc.] 1. A large concreted mass of stony material; a large fixed stone or crag. See {Stone}. [1913 Webster] Come one, come all! this rock shall fly From its firm base as soon as I. Sir …   The Collaborative International Dictionary of English

  • Rock 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… …   The Collaborative International Dictionary of English

  • rock crystal — ► NOUN ▪ transparent quartz, typically in the form of colourless hexagonal crystals …   English terms dictionary

  • rock crystal — n. a transparent, esp. colorless, quartz …   English World dictionary

  • rock 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… …   Universalium

  • rock crystal — kalnų krištolas statusas T sritis chemija apibrėžtis Bespalvis, skaidrus kvarcas. formulė SiO₂ atitikmenys: angl. rock crystal rus. горный хрусталь …   Chemijos terminų aiškinamasis žodynas

  • rock crystal — rock′ crys tal n. mir transparent quartz, esp. when colorless • Etymology: 1660 …   From formal English to slang

  • rock crystal — noun Date: 1666 crystal 1 …   New Collegiate Dictionary

  • rock-crystal — n. Limpid quartz, mountain crystal …   New dictionary of synonyms

  • rock crystal — noun clear, colourless form of the silica based mineral quartz, often called pure quartz or clear quartz …   Wiktionary

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