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Text File  |  1992-09-02  |  190b  |  6 lines
  1. A green or black rock-forming mineral, one of
  2. the amphiboles; it is a hydrous silicate of
  3. calcium, iron, magnesium, and aluminium.
  4. Hornblende is found in both igneous and
  5. metamorphic rocks.
  6.