Name your assortment: Name need to be under people Opt for a group: Unable to load your collection due to an error Tourmalines have an exceedingly complicated chemistry which can be described by a common system XY3Z6(BO3)3T6O18V3W. The T6O18 is The essential ring framework, the place T is generally Si4+, but substitutable by Al3+ or B3+. Tourmal