Iolite is also called Water Sapphire and is the name for the gem variety of Cordierite. It was thought to have been used by the Vikings to aid with navigation, by acting as a polarising filter to help them determine the position of the sun on cloudy days. It was first discovered in 1813 and named after Louis Cordier, the French Geologist. The more common name Iolite comes from the Greek for Violet.

Alternative Names Cordierite, Water Sapphire
Colour Purple
Hardness 7 - 7.5
Crystal system Orthorhombic
Streak White
Lustre Vitreous, Resinous
Main Locations Australia, Brazil, India, Madagascar, Sri Lanka, Burma
Chakra Throat, Third Eye
Zodiac Libra, Sagittarius, Taurus
Numerology 7
Planetary Saturn
Element Air