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Text File  |  1992-09-02  |  243b  |  7 lines
  1. A silicate mineral,
  2. (Fe,Mg)2(Al,Fe)gSi4O20(OH)2. It forms brown
  3. crystals that may be twinned in the form of a
  4. cross. It is a useful indicator of medium
  5. grade (moderate temperature and pressure) in
  6. metamorphic rocks formed from clay sediments.
  7.