Rocks, minerals and crystals

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Across
  1. 1. molten rock below the ground
  2. 3. the hardest crystal
  3. 4. metamorphic rock used for sculptures
  4. 5. Minerals often occur in beautiful shapes and
  5. 7. science of rocks
  6. 11. a blue precious gem
  7. 12. natural substances with crystals in patterns
  8. 13. often called volcanic glass
  9. 15. expensive crystals
  10. 16. the layer of Earth on which we live
  11. 17. extrusive rock with small crystals
  12. 18. element 26 in the periodic table which makes
  13. 19. molten rock above the ground
Down
  1. 1. next layer after the crust
  2. 2. a green gem
  3. 4. type of rock made from igneous or sedimentary
  4. 6. a red gem
  5. 8. igneous formed above ground
  6. 9. rocks made by cooling magma
  7. 10. type of rock made from small bits of material
  8. 12. than 80% of the earth core
  9. 14. igneous formed below the ground