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Thulium: Occurrence (Site not responding. Last check: 2007-10-29) |
 | | The most important sources of thulium are the minerals rich yttrium: xenotime, gadolinite, euxenite, samarskite, fergusonite, blomstrandine, loparite and yttroparisite. |
 | | Blomstrandine in Norway, luparite and yttroparisite in Russia. |
 | | Of these minerals, the xenotime and the gadolinite are the ones most easily treated through chemical reaction, originating the pure concentrates of rare-earths. |
| nautilus.fis.uc.pt /st2.5/scenes-e/elem/e06920.html (221 words) |
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