Click on a Quality Level

  1. Exceptional sample, with a very pure or very large mineral
  2. Exceptional sample
  3. Excellent sample, with a very pure or very large mineral
  4. Excellent sample
  5. Very good sample, with a very pure or very large mineral
  6. Very good sample
  7. Additional sample
About the quality levels : see Guillemin and Mantienne
(C) Copyright BRGM, ENSMP 1983.

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