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Tourmaline is the name given to a very chemically complex (A(D3)G6(Si6O18)(BO3)3X3Z) family of stones. With slight chemical differences it comes almost every colour varying from light to dark. All types of tourmaline form according to a hexagonal crystal system and have a hardness of 7.5 on the Mohs scales. These are considered precious stones and some varieties are highly valued.