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Text File  |  1992-09-03  |  188b  |  6 lines
  1. A silicate mineral, KAlSi2O6, occurring
  2. frequently in some potassium-rich volcanic
  3. rocks. It is dull white to grey, and usually
  4. opaque. It is used as a source of potassium
  5. for fertilizer.
  6.