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Text File  |  1992-09-03  |  239b  |  7 lines
  1. Alluminium silicate, Al2SiOs, a pale blue
  2. mineral occurring as blade-shaped crystals.
  3. It is an indicator of high pressure
  4. conditions in metamorphic rocks formed from
  5. clay sediments. Andalusite, Kyanite, and
  6. sillimanite are all polymorphs.
  7.