Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
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The Mineral and Gemstone Kingdom is a free informational and educational guide to rocks, minerals, gemstones, and jewelry. This site has been providing detailed information and photos of hundreds of mineral and gemstone since 1997 and is one of the leading education resources on minerals and gemstones.

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tourmaline
10/15/2017
The simple chemical formula, which covers the main forms of Tourmaline (Elbaite, Schorl, and Dravite), is as follows:
(Na,Ca)(Mg,Li,Al,Fe2+)3Al6(BO3)3Si6O18(OH)4

The expanded formula, which additionally covers Uvite, Liddicoatite, and Buergerite, is as follows:
(Na,Ca)(Mg,Li,Al,Fe2+,Fe3+)3(Al,Mg)6(BO3)3Si6O18(OH,O,F)4

The formula for the Tourmaline group is very complex. See The chemical formula of Tourmaline for more details.

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