According to Wikepedia.com "It is one of several forms of quartz. Amethyst is a semiprecious stone and is the traditional birthstone for February. The name comes from the Koine Greek ἀμέθυστος amethystos from ἀ- a-, "not" and μεθύσκω methysko / μεθύω methyo, "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. The ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication."
"Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions. Amethyst occurs in primary hues from a light pinkish violet to a deep purple. Amethyst may exhibit one or both secondary hues, red and blue. The best varieties of amethyst can be found in Siberia, Sri Lanka, Brazil and the far East."
Amethyst has long been called the "sobriety stone." In ancient Rome, crushed amethyst was added to wine cups to prevent drunkenness. It is said to assist with healing alcoholism, compulsive behaviors, and addictions of all kinds. Amethyst brings energies of stability, peace, calm, balance, courage and inner strength. It has been used to protect against psychic attacks. On the spiritual level, amethyst can help