tourmaline
IPA: tˈʊrmʌɫin
noun
- (mineralogy) A complex black or dark-coloured borosilicate mineral, compounded with various chemical elements and considered a semi-precious stone.
- A transparent gemstone cut from it.
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Examples of "tourmaline" in Sentences
- Tourmaline has a variety of colors.
- Chemical composition tourmaline group.
- The most common species of tourmaline is schorl.
- The best known crystal of this type is tourmaline.
- Stones in this category include emerald and tourmaline.
- The aplite minerals include tourmaline, topaz and fluorite.
- THe spereation of tourmaline by color is at best inaccurate.
- Buergerite is a mineral species belonging to the tourmaline group.
- California became a large producer of tourmaline in the early 1900s.
- For more information on paraiba tourmaline, see article on tourmaline.
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