Rock, Gems, and Mineral

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Across
  1. 5. Scientific word for heft/weight
  2. 10. Rocks changed by heat/pressure
  3. 12. Igneous rocks cooled outside
  4. 13. To break along flat atomic surfaces
  5. 17. NaCl in natural mineral form
  6. 18. Scale for mineral hardness
Down
  1. 1. Green form of Beryl gemstone
  2. 2. Layers of rock cemented together
  3. 3. Red corundum
  4. 4. Dark colored igneous rock
  5. 5. Scientific formula for Quartz
  6. 6. Yellow/brown Quartz
  7. 7. Looking like metal
  8. 8. Not a diamond but still carbon
  9. 9. 2.5 on the Mohs scale
  10. 11. Actual color of mineral
  11. 14. Very common igneous rock
  12. 15. Only found in sedimentary rocks
  13. 16. 10 on the Mohs scale