TOURMALINE
Tourmaline
Tourmaline is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors. The name comes from the Sinhalese word "Thuramali" or "Thoramalli", which applied to different gemstones found in Sri Lanka.The above text is a snippet from Wikipedia: Tourmaline
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tourmaline
Noun
- A complex black or dark coloured borosilicate mineral.
- A transparent gemstone cut from it.
The above text is a snippet from Wiktionary: tourmaline
and as such is available under the Creative Commons Attribution/Share-Alike License.