Tourmaline is not a single mineral, but a group of several closely related minerals. The three most well-known members are Elbaite, Schorl, and Dravite. It is the most multicolored mineral type known, occurring in virtually every color of the spectrum. Tourmaline can form in extremely aesthetic slender crystals that are highly valued by collectors. It is one of the most prized minerals, and fine crystals can be among the most beautiful examples in the mineral kingdom.  Many fine crystals are preserved for their beauty. Thick, elongated crystals are sometimes sliced into sections and sold as “Tourmaline cross sections”.