Iolite Description - GIA
https://www.gia.edu/iolite-description
WebThe color of fine-quality iolite can sometimes rival that of sapphire or tanzanite. – Robert Weldon When tanzanite was first discovered, gemologists initially suspected it might be cordierite, a transparent, pleochroic, violet-blue gem known for thousands of years. Today, cordierite (named after geologist Pierre Cordier) is better known by its trade name, iolite, which comes from the Greek ...
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