Gemstone: Achroite Tourmaline There are an array of different names and categories to the Tourmaline gemstone household, although these are generally divided into these sub-groups: Dravite, Schorl and Elbaite, which is named after the Italian island of Elba. Achroite Tourmaline is a member of the Elbaite sub-group of Tourmalines. Birthstone Month: Tourmaline is one of both gemstones associated with the month of October. Zodiac: Being one of the two accepted birthstones for the month of October, Tourmaline is one of the zodiac gemstones for Libra and Scorpio. Chemical Symbol: The general symbol for Tourmaline is (Na, Ca)(Li, Mg, Al)(Al, Fe, Mn)6(BO3)3(Si6O18)(OH)4 Chemical Make-up: Achroite Tourmaline is made up of Sodium, Lithium and Aluminum Brorsilicate components. History
