Each stone varies. Dumortierite is found in Brazil, Sri Lanka, Madagascar, Canada, Poland, France, Namibia and the USA. Its colors can vary between dark blue, violet blue and even red-brown. This stone is typically used for Divine inspiration, psychic ability, inner guidance, enhanced learning capacity and mental discipline.
It helps wiht higher vision and inspiration for one to see past obstacles in their life as well as aiding for prophetic dreams.
Physically, dumortierite can help support one if they feel foggy or unable to focus on day to day activities. It's not as active on the physical level as much as it is with general mental balance.