The Very Highest Quality Tourmaline Information... |
Tourmaline |
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Colour
Tourmaline exists in more colours than any other gemstone. The most common colour is a dark green, but bright green chrome tourmalines are seen, as are blue, red, pink, orange, yellow, colourless, brown, violet and black. Strongly coloured pink tourmaline is sometimes called rubellite.
Chatoyancy
Chatoyancy or chatoyance, literally from French means cat's eye. Seen best in cat's eye chrysoberyl, but also found in a few other gemstones including tourmaline.
Technical Information
Chemical Composition and Name | - Complex Aluminium Borosilicate |
Hardness | 7.0 to 7.5 |
Refractive Index | 1.616 - 1.634 to 1.630 - 1.652 |
Bi-refringence | 0.014 to 0.021 |
Other Optical Properties | Uniaxial |
Optic Sign | Negative |
Specific Gravity | 3.02 - 3.26 |
Crystalline System | Trigonal |
Gemstone | Weight | Shape | Size & Description | Available | Price £ | Price $ |
Green Tourmaline | 0.39 | Oval | 6x4 | Yes | £18.00 | $Ask |
Multi-Coloured Tourmaline | 0.96 | Octagon | 6.5x5 | Yes | £24.00 | $Ask |
Pink Tourmaline | 0.11 | Round | 3 | Yes | £12.00 | $Ask |
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