ROCKS AND MINERALS

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Across
  1. 5. this mineral is commonly found in our bones
  2. 6. composed mostly of minerals found in clay
  3. 8. softest rock in the world
  4. 10. physical property of a mineral
  5. 13. how many different types of rock?
  6. 14. first female geologist
  7. 15. glassy igneous rock
  8. 19. composed of grains of sand
  9. 20. type of rock found on mars
  10. 21. can be found in five different forms
  11. 22. second most abundant mineral in earth's crust
  12. 23. the study of rocks
Down
  1. 1. one of the lowest density rocks
  2. 2. mineral found in most natural waters
  3. 3. hardest mineral in the world
  4. 4. black in color and among the densest volcanic rocks
  5. 7. the only rock we can eat
  6. 9. brightest mineral in the world
  7. 11. this rock type comes from molten magma
  8. 12. extrusive, silica-rich igneous rock
  9. 14. this rock has been found on the moon
  10. 16. most abundant type of rock in the crust of the earth
  11. 17. formed in shallow, warm marine waters
  12. 18. this rock type often contains fossils
  13. 21. one of the hardest substances on earth