
Crystalline quartz in shades of purple, lilac or mauve is called Amethyst stone, a stone worn to guard against drunkenness and to instill a sober mind. Amethyst stone is believed to protect one from poison. It is used as a dream stone and to help insomnia.
Ancient Egyptians used the amethyst guard against guilty and fearful feelings. It has been worn as protection from self-deception, as well as a protection against witchcraft. The amethyst has long been used to open the spiritual and psychic centers, making it one of the power stones.
It is also used as a meditation aid when worn as a necklace. Amethyst is used for problems in the blood and in breathing problems. Amethyst crystal clusters are believed to keep the air and life force in the home clean and positive.