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Iolite

Iolite - Gem of the Vikings. When legendary Viking explorers ventured far out into the Atlantic Ocean, far away from any coastline, they had a secret gem weapon: iolite. The Viking mariners used thin pieces of iolite as the world's first polarizing filter. Looking through an iolite lens, they could determine the exact position of the sun, and navigate safely to the new world and back.

Iolite The property that made iolite so valuable to the Vikings is extreme pleochroism. Iolite has different colors in different directions in the crystal. A cube cut from iolite will look a violetish blue almost like sapphire from one side, clear as water from the other, and a honey yellow from the top. This property led some people to call iolite "water sapphire" in the past, a name that is now obsolete.

Pleochroism may have been helpful in navigation but it makes things difficult for a gem cutter. If iolite is not cut from exactly the right direction, no matter the shape of the rough, its color will not show to its best advantage.
The name iolite comes from the Greek ios, which means violet. Iolite is usually a purplish blue when cut properly, with a softness to the color that can be quite attractive.

Iolite is readily available and surprisingly affordable. The better and richer the blue, the better. It is mined in India, Sri Lanka, Mozambique, Zimbabwe, and Brazil. The Vikings probably mined iolite from deposits in Norway and Greenland.
Iolite is relatively hard but should be protected from blows. With its attractive color and reasonable price, it may become a jewelry staple in the future.

Iolite - Main Characteristics

ClassificationMineral
Hardness (Mohs Scale)7
Molecular formulaFe2Al4Si5O18
CompositionAluminium Silicate.
Crystal ShapeGranular.
Color/SpectrumBlue, red, purple and yellow gamma.
Atomic (Crystal )Structure None-symmetrical.
Index of Refraction1.5 - 1.6
Density (Relative)2.6 - 2.7
Light interactionVitreous
UsesJewelry, ornamental, other.

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