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quartzmore about quartz

quartz


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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. 
 
  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. 
 
  From  WordNet  r  1.6  [wn]: 
 
  quartz 
  n  1:  colorless  glass  made  of  almost  pure  silica  [syn:  {quartz 
  glass},  {vitreous  silica},  {lechatelierite},  {crystal}] 
  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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