Mainly Gemstones

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Across
  1. 3. "Rock Layers"
  2. 6. Heaviest metal
  3. 8. Red Gemstone (4 letters)
  4. 9. Hardest gemstone
  5. 11. Conductive Metal
  6. 12. cooled magma
  7. 13. Blue Gem
  8. 15. Augusts birth stone
  9. 17. Fe
  10. 19. Strong Material
  11. 20. Light Blue Gem
  12. 21. An Element Found in Diamonds
  13. 22. Man's best friend
Down
  1. 1. rainbow gem
  2. 2. Rapidly cooled magma
  3. 4. ________ are on the periodic table
  4. 5. Think December (not holidays)
  5. 6. O2
  6. 7. Cursed diamond (two words)
  7. 10. Last rock stage
  8. 14. Mr. Crabs Daughter
  9. 16. villagers love them
  10. 18. The birthstone is Purple