Kyanite

Kyanite is typically a blue silicate mineral, commonly found in aluminum-rich sedimentary rock.  It sometimes displays cat's eye chatoyancy.  Kyanite looks best in daylight and exhibits a vitreous to near-pearly luster when cut and polished.

Kyanite is valuable in the industrial world for heat resistance and is used in a wide variety of products.

Kyanite deposits can be found in many locations around the world. Some of the most important sources include Austria, Burma, Brazil, Cambodia, India, Kenya, Myanmar, Nepal, Russia, Serbia, Switzerland, Tanzania, the United States (Connecticut, Pennsylvania, North Carolina and Georgia) and Zimbabwe. 

Kyanite is said to promote good communication.  It is believed to aid with self-expression