Fluorite can act as a "psychic vacuum cleaner", clearing the atmosphere of confusion, cluttered thoughts, negativity and astral contamination. It is balancing to the third eye and to mental energies in general. It can assist one in thinking clearly and in making subtle but important discriminations regarding the kinds of energies and people one will allow one's world.
Purple Fluorite is ideal for purification and access of the remind to the domains of spirit. Black Fluorite is the ultimate cleanser. Yellow Fluorite magnifies the mental powers and enhances intellectual ability. Green Fluorite can cleanse and heal the heart chakra. Pink Fluorite cleanses and heals the emotional body and works to activate the "high heart" chakra, or "seat of the soul". Blue Fluorite is good for the throat chakra, ensuring clear communication of one's ideas.
Fluorite harmonizes with Black Tourmaline, Smoky Quartz, Jet, Obsidian, Lapis, Iolite, Golden Labradorite, Heliodor, Emerald, Dioptase, Pink Tourmaline, Rose Quartz, Morganite and Calcite.
Source: "The Pocket Book of Stones" by Robert Simmons.