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Iolite gets its name from the Greek, "ios" for violet, and ranges in color from deep blue to light blue, gray and yellowish blue-gray. The world's main resources for iolite are Sri Lanka, Brazil, Myanmar (Burma) Madagascar, Canada, India, Tanzania and Namibia. Some of the Sri Lankan iolite is called "bloodshot iolite" when a peculiar inclusion is present that causes a stone to appear red if viewed from certain angles. Iolite is generally "eye-clean" and is fairly hard (7 to 7.5 on the Mohs scale.)
Iolite has been found in ancient Columbian remains, and the Vikings used to use the stone as a compass on cloudy days as its trichroic qualities allowed them to find the sun through the fog.
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