Iolite 12mm Faceted Heart - 15-16 Inch Cape Amethyst It is composed of silicon

It is composed of silicon dioxide

It appears green because of traces of Chromium

but a combination of minerals

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Iolite 12mm Faceted Heart - 15-16 Inch Cape Amethyst It is composed of siliconIolite most commonly occurs in shades of blue to gray, violet or indigo. It displays a visual property called pleochroism, which means that it can appear to be different colors as it shifts in the light. According to Norse legend, Viking explorers used thin pieces of Iolite as the worlds first polarizing lens to help them determine the exact location of the sun for navigation.