7.0 - 7.5 on the Mohs scale.

Sri Lanka (Ceylon), Brazil, Spain, Austria, Italy, Canada, Russia, Australia and the U.S..

Named after the province of Andalusia, Spain, where andalusite was first found, it varies from pale yellow to dark green, brown and greenish red. Like alexandrite, andalusite changes in color depending on which way you look at it, and on how it's lighted. The same stone can appear green, red or even have flashes of yellow.

Andalusite is not enhanced.

More information on gemstone enhancements.