What is tourmaline?
"Tourmaline" refers to a large group of minerals with similar crystal structure and varying chemical composition. Very few naturally occurring tourmalines are suitable for use as gemstones. Tourmaline is a relatively hard (7.0 Mohs' hardness) gemstone, consisting of borosilicates of aluminum, sodium and magnesium . Tourmaline is one of the most diversely colored of all gems and minerals - occurring in nearly every color imaginable.
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