Tourmaline

Tourmaline can be found in almost all the colours of nature, from almost totally transparent to black, but the most appreciated colour for this gemstone is green, especially when it resembles the colour of emeralds. One of the distinctive features of tourmaline is that the same stone can take on different tones depending on the light, giving it a captivating and exciting variability. The most important deposits are in Brazil. (Minas Gerais, Pariba)

Color: Colorless, pink, red, yellow, borwn, green, blue, violet, black, multicolored
Moh's hardness: 7-7.5 
Chemical composition:MgAl2O4 Mangesium aluminium oxide

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