description Iolite Overview
Iolite is the gem variety of cordierite, a magnesium- and aluminum-bearing silicate mineral that commonly appears blue, violet-blue, or grayish. It is strongly pleochroic, meaning that its apparent color changes when viewed from different directions, so careful cutting is important. Iolite is used in jewelry and is associated with the historical claim that Viking navigators used clear cordierite crystals as polarizing filters to locate the sun through cloud or haze.
help Iolite FAQ
How good is Iolite?
Iolite scores 5.06/10 (Mediocre) on Lunoo, making it rated in the Gemstone category.
What are the best alternatives to Iolite?
See our alternatives page for Iolite for a ranked list with scores. Top alternatives include: Tanzanite, Indicolite Tourmaline, Rhodolite Garnet.
How does Iolite compare to Tanzanite?
See our detailed comparison of Iolite vs Tanzanite with scores, features, and an AI-powered verdict.
Is Iolite worth it in 2026?
With a score of 5.06/10, Iolite is a solid option in Gemstone. See all Gemstone ranked.
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