Rocks Crossword Puzzle

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Across
  1. 7. A hard, often light-colored rock formed by the metamorphism of quartz-rich sandstone
  2. 9. A dark-colored igneous rock with a lower silica content
  3. 10. A mineral commonly used as iron ore
  4. 16. An igneous rock that often contains diamonds
  5. 17. See the picture on the back
  6. 18. A feldspar that doesn't contain sodium
  7. 19. Common in shallow water environments
  8. 20. See the picture on the back
Down
  1. 1. A light-colored igneous rock with a high silica content
  2. 2. A clastic sedimentary rock with fine texture and a composition of quartz and clay
  3. 3. See the picture on the back
  4. 4. Owes its glassy texture as a result of rapid cooling
  5. 5. An igneous rock that is commonly used for countertops and floors
  6. 6. Formed by the metamorphism of quartz-rich sandstone
  7. 8. A chemical sedimentary rock with fine to coarsely crystalline texture and his made up of halite
  8. 11. See the picture on the back
  9. 12. A metal sulfide that contains lead
  10. 13. An spongy igneous rock that forms due to trapped gas bubbles in magma
  11. 14. Forms when lava or magma cools and crystallizes
  12. 15. Microcrystalline quartz