Mineral Crossword Puzzle

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Across
  1. 6. this is used for hydrofluoric acid and has a harness of 4.
  2. 7. this is used for steel and it is magnetic
  3. 9. this is used for construction materials and comes in thin flexible sheets.
  4. 10. this has a hardness of 5-6 and cleaves in two directions
  5. 11. this has a hardness of 5.5 and comes in colors of black-green.
  6. 13. this mineral is used for batteries and is a metallic silver.
  7. 17. this can be easily scratched by a fingernail and is used for plaster of paris.
  8. 18. this bubbles with acid and is used for cement.
  9. 19. this mineral has a greasy feel, and is used for ceramics
  10. 20. this mineral can melt ice and has a hardness of 2.5
  11. 21. this mineral is brassy yellow, used for ore of sulfur.
Down
  1. 1. this has a white-yellow streak and is used for sulfuric acid.
  2. 2. this mineral is white-gray, and is used for ceramics and glass.
  3. 3. this is used for paint and roofing and comes in colors of colorless to yellow.
  4. 4. this mineral comes in colors of dark red-green and has a very high harness of 6.5 to 7.5.
  5. 5. this has a red-brown streak and is used for ore of iron.
  6. 8. this is used for furnace bricks and has a hardness of 6.5
  7. 12. this mineral has a hardness of 1-2 and is used for pencil lead.
  8. 14. this is used for ceramics and glass and cleaves in 2 directions.
  9. 15. this bubbles with acid when powdered and is used for building stones.
  10. 16. this mineral can form hexagonal crystals and is used for glass jewelry.