Tourmalines are complex boron and aluminum silicate minerals (gemstones) of different compositions. Tourmaline comes in many colors depending on its mineral composition. Black is the most common. The colored ones, when transparent and skinny, 3-, 6- or 9-sided prismatic crystals in parallel or radiating groups, which causes it to develop an electrical charge when heated. It is known as a cooling stone and naturally emits negative ions.
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