|The Very Highest Quality Tourmaline Information...|
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.
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.
|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|
|Specific Gravity||3.02 - 3.26|
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