Global Gemstone Certification
Tourmaline
Tourmaline
The slim structures of this stone in its natural form change color from one end to the other. There is a massive variety of different colors of this stone available including orange, pink and green. It’s worth noting that this is not one mineral. Instead, it is a group of minerals that share chemical and physical properties.
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Chemical Formula |
Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details. |
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Color |
White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Black, Multicolored |
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Hardness |
7 – 7.5 |
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Crystal System |
Hexagonal |
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Refractive Index |
1.616 – 1.650 |
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SG |
2.9 – 3.3 |
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Transparency |
Transparent to opaque |
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Double Refraction |
.018 |
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Luster |
Vitreous |
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Cleavage |
3,2 |
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Mineral Class |
Tourmaline |