Rocks, minerals and crystals

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Across
  1. 2. a type of metamorphic rock used in the art of
  2. 3. the hardest crystal
  3. 5. Minerals often occur in beautiful shapes and
  4. 7. igneous formed above ground
  5. 8. natural substances with crystals in patterns
  6. 10. science of rocks
  7. 12. a blue precious gem
Down
  1. 1. type of rock made from small bits of material
  2. 4. igneous formed below the ground
  3. 6. type of rock made from igneous or sedimentary
  4. 9. rocks made by cooling magma
  5. 11. expensive crystals