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Tourmaline

Tourmaline is a complex, crystalline boron inosilicate. The mineral is a semi-precious gemstone and occurs in a variety of colors and forms.


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Properties

Mineral Class

Silicates

Hardness

7 - 7.5

Crystal System

Trigonal

Luster

Vitreous

Chemical Formula

(Ca,K,Na,&nbsp;▢) / (Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6<br>
(BO3)3(Si,Al,B)6O18(OH,F)4)

Streak

White

Uses & Applications

With high transparency and vibrant color, Tourmaline is used in jewelry in the form of facets and valued as a collectible mineral.

Associated Minerals

  • Quartz

  • Albite

  • Muscovite

  • Lepidolite

  • Cleavelandite

Notable Localities

View More Tourmaline Localities ▸

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Varieties

Schorl

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Dravite

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Elbaite

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Rubellite

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Additional Resources

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Properties
Uses & Applications
Associated Minerals
Notable Localities
Varieties
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