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What is a tourmaline?

What is a tourmaline? Here are some definitions.

Noun
  1. A complex black or dark-coloured borosilicate mineral, compounded with various chemical elements and considered a semi-precious stone.
  2. A transparent gemstone cut from it.
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Examples
Her collection is not much but it includes mica, aquamarine, tourmaline, rubies and rose quartz.
Although blue corundum, zircon, and tourmaline occur in Colorado, they are not known to produce gems.
Before nightfall, the group had seen amethyst, citrine, imperial topaz, aquamarine, tourmaline, and even alexandrite.
During the formation of pockets, schorl was the dominant early tourmaline species forming and is found along the margins of the pockets.
Her collection is not large, but it includes mica, aquamarine, tourmaline, and other pretty stones.
Since 1900 the site has sporadically produced gem tourmaline as well as rhodizite and beryl.

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