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6. Fire Opal

  • Metamorphic
  • Igneous
  • Sedimentary

7. Granite

  • Igneous
  • Sedimentary
  • Metamorphic

8. Rhyolite

  • Metamorphic
  • Igneous
  • Sedimentary

9. Slate

  • Sedimentary
  • Metamorphic
  • Igneous

10. Conglomerate

  • Sedimentary
  • Igneous
  • Metamorphic

11. Gneiss

  • Metamorphic
  • Igneous
  • Sedimentary

12. Pumice

  • Igneous
  • Sedimentary
  • Metamorphic

13. Hornfels

  • Sedimentary
  • Metamorphic
  • Igneous

14. Oil shale

  • Sedimentary
  • Igneous
  • Metamorphic

15. Coal

  • Sedimentary
  • Igneous
  • Metamorphic

16. Andesite

  • Metamorphic
  • Igneous
  • Sedimentary

17. Flint

  • Metamorphic
  • Sedimentary
  • Igneous

18. Limestone

  • Metamorphic
  • Sedimentary
  • Igneous

19. Shale

  • Sedimentary
  • Igneous
  • Metamorphic

20. Obsidian

  • Metamorphic
  • Igneous
  • Sedimentary