Apatite

Composition: Apatite is calcium fluorine-chlorine-hydroxyl phosphate, often with manganese and cerium.
Hardness: 5

Metaphysical Properties: Apatite stimulates intellect, promotes realization. Stimulates development of clairvoyance, telepathy. Apatite Enhances creativity.

Astrological Sign: Gemini

Corresponding Chakras:
Blue Apatite - Throat Chakra
Yellow Apatite - Solar Plexus Chakra.
Apatite also helps remove blockages from all chakras.