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» Iolite

Iolite is a silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. The name iolite comes from the Greek ios, which means violet. Iolite is a blue silicate mineral that occurs as crystals or grains in igneous rocks, only as a result of contamination of the magma by aluminous sediment. The property that made iolite so valuable to the Vikings is extreme pleochroism. Iolite has different colors in different directions in the crystal. The gemstone changes colors depending upon which angle it is viewed from.

Iolite, known as the Vikings' compass, due to it's ability to determine the direction of the sun on overcast days. When the legendary Viking mariners sailed the wide ocean, they 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.


















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