Fluorite:

Also known as Fluospar.  It is a natural calcium chloride. Fluorite helps bring the spiritual into the material and quickens enlightenment. Helps heal holes in one's aura where energy is drained. Grounds, balances and focuses one's energies. Absorbs and alters negative and other energies. Opens the Chakras. Aids physical and mental healing. Strengthens bone tissue, especially teeth enamel. Relieves dental disease, pnemonia and viral inflammation.  Enhances the ability to concentrate.

Comes in several different colours such as: pink, purple and yellow.