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  1. Element Approximate % by weight
  2.  
  3. Oxygen 46.6
  4. Silicon 27.7
  5. Aluminum 8.1
  6. Iron 5.0
  7. Calcium 3.6
  8. Sodium 2.8
  9. Potassium 2.6
  10. Magnesium 2.1
  11. All others 1.5
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