Rocks Crosswords

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Across
  1. 2. Forms when lava or magma cools and crystallizes, and includes obsidian and diorite
  2. 5. Rocks that are dark-colored and have lower silica contents
  3. 7. A chemical sedimentary rock with fine to coarsely crystalline texture and composed of halite
  4. 9. A hard, often light-covered rock formed by the metaporphism of quartz-rich sandstone
  5. 11. A clastic sedimentary rock with fine texture and composed of quartz and clay
  6. 12. Microcrystalline quartz
  7. 14. An igneous rock that owes its glassy texture to rapid cooling
  8. 15. A metamorphic rock with fine to coarse grained texture and is composed of calcite and dolomite
  9. 16. An ultrabasic rock that often holds diamonds
Down
  1. 1. Rocks that are light-colored and have a high silica contents
  2. 3. Used in countertops and floors
  3. 4. common in shallow water environments
  4. 6. An igneous, spongy-looking rock that form due to trapped gas bubbles
  5. 8. A feldspar that doesn't contain sodium
  6. 10. An oxide that is commonly used as iron ore
  7. 13. A sulfide that contains lead