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2 definitions found
 for quartz
From The Collaborative International Dictionary of English v.0.48 :

  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
     [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]

From WordNet (r) 3.0 (2006) :

      n 1: colorless glass made of almost pure silica [syn: quartz
           glass, quartz, vitreous silica, lechatelierite,
      2: a hard glossy mineral consisting of silicon dioxide in
         crystal form; present in most rocks (especially sandstone and
         granite); yellow sand is quartz with iron oxide impurities

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