| 11. | Initially, the nomenclature for this tourmaline was " Para�ba tourmaline ".
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| 12. | Initially, the nomenclature for this tourmaline was " Para�ba tourmaline ".
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| 13. | He described it as artificial tourmaline, a semi-precious gem.
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| 14. | "It's a tourmaline,"
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| 15. | It also has a junior club for young mineral collectors called the Tourmalines.
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| 16. | The bright colors of this tourmaline are due to the presence of copper.
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| 17. | The best known crystal of this type is tourmaline.
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| 18. | Occasional tourmaline can also be found in the paragneisses.
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| 19. | The aplite minerals include tourmaline, topaz and fluorite.
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| 20. | :: Tourmaline is a sort of gemstone because it has hardness 7.
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