geology

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Across
  1. 5. the hardest natural material on earth
  2. 7. an intensely blue semi-precious stone prized for millenia
  3. 9. the official stone of Ohio was often used to make arrowheads
  4. 10. used to make glass
  5. 13. sedimentary rock formed over millions of years when grains of sand are compacted together
  6. 14. pencil 'lead' is actually made of this
  7. 15. like many gemstones, it comes in many colors, but the most famous are blue
  8. 16. pink variation of #across/down, known as the love crystal
  9. 18. most common material in minecraft
  10. 19. a blood-red gemstone
Down
  1. 1. black volcanic glass
  2. 2. green stone carved by Chinese artisans for thousands of years
  3. 3. molten rock
  4. 4. preserved remains of prehistoric creatures
  5. 6. brown + golden stone named for a feline
  6. 8. dark stone with iridescent, peacock-like colors when hit by light
  7. 11. purple variety of #across/down
  8. 12. very hard mineral found in many colors, sometimes used for countertops
  9. 14. a hollow rock with crystals inside
  10. 17. fossilized tree sap