Amethyst is actually violet to red-purple quartz, identical in structure to clear quartz. It is ruled by the element of Air.
Amethyst and magic have been connected for at least 2,000 years. The Greeks believed it to be an amulet against inebriation and in fact the name comes from the Greek [A-methystos], meaning 'not tipsy'. It is one of the few stones specifically recommended for men to use for attracting women. Amethyst is also the birthstone for February.
Amethyst can be used to increase psychic awareness, to sharpen the 'sixth sense'. Because of this, many people keep a crystal with their I-Ching, tarot, or Rune tools. It is considered a very spiritual stone and is one of the most popular stones used for amulets and jewelry.
This stone is the major stone for the Crown Chakra and is often used in healing for headaches and of the nervous system and the brain. It is also an excellent calming stone to help with anxiety and depression. It is also helpful for overcoming addictions.
It can be used on an altar or wand to represent Air and the Intellect and in spell work for these purposes as well. Because it is a hard stone, it will not dissolve in water so is sometimes added to spring water and allowed to sit in the sun or moonlight with the water than drunk to absorb the stones properties.