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Text File  |  1992-09-01  |  190b  |  6 lines
  1. Mineral, aluminium fluosilicate,
  2. Al2SiO4(F,OH)2. It is usually yellow, but
  3. pink if it has been heated, and is used as a
  4. gemstone when transparent. It ranks 8 on the
  5. Mohs' scale of hardness.
  6.