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It has hardness of 7 - 7.5 Mohs. It is formed of complex aluminum borosilicate (Elbaite, Dravite, Uvite) and its specific gravity is 3.03 - 3.25.
Tourmalines are precious stones displaying a unique splendour of colours. According to an ancient Egyptian legend this is the result of the fa ct that on the long way from the Earth's heart up towards the sun, Tourmaline travelled along a rainbow. And on its way it collected all the colours of the rainbow. This is why nowadays it is called the "Rainbow gemstone". The following varieties of gemstones come under it -
Achorite: Colorless
Brazilian emerald: Green
Dravite: Brown
Indicolite: Dark blue
Rubellite: Pink to red
Siberite: Violet
Verdilite: Green
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