Do you know your lanthanides/rare earth elements?

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Across
  1. 3. named after the mythological northern land of Thule
  2. 5. named after a Russian mine official (hint: firstname - Vasili)
  3. 8. used in computer hard drives, and in your headsets
  4. 10. rare earth mineral that has the elements thorium and uranium
  5. 13. used as an MRI contrast agent (dye)
  6. 18. named after the old name of Paris
  7. 19. short for zirconium silicate; has trace amounts of rare earth metals
  8. 20. lightest rare earth element; named after Scandinavia
  9. 21. a vanadate mineral
  10. 23. one of the metals that make terfenol-D; from the greek word meaning "hard to get at"
  11. 24. a group of carbonate minerals
Down
  1. 1. named after Stockholm, native city to one of it's discoverers
  2. 2. a rare earth phosphate mineral
  3. 4. named after the continent of Europe
  4. 6. also named after the village of Ytterby, Sweden
  5. 7. named after the greek phrase to be hidden
  6. 9. named after a small planet and Roman goddess of agriculture
  7. 11. named after a Titan who brought fire to mortals (mythology)
  8. 12. another name for the mineral ytterbite
  9. 14. mineral named from the Greek "sphenos"
  10. 15. one of the 4 rare earth elements named after Ytterby, Sweden
  11. 16. a rare earth deposit that has fluorine in it
  12. 17. one of the greek words (pradios) that makes the name means leek-green
  13. 22. also named after Ytterby, Sweden; used to make terfenol-D as well
  14. 25. currently the country with the largest source of rare earths