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Text File  |  1992-09-04  |  191b  |  7 lines
  1. A chalcedony is a form of quartz, SiO2, in 
  2. which the crystals are so fine-grained that 
  3. they are impossible to distinguish with a 
  4. microscope (cryptocrystalline). 
  5.  
  6. Subject by: Russell Webb
  7.