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commonly with inclusions of copper in speckled patterns throughout the stone
which may form green stains or specks on Azurite crystals or aggregates
sapphires get their various colors from trace elements
as legend has it
Iolite 12mm Faceted Heart - 15-16 Inch Cape Amethyst commonly with inclusions of copperIolite 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.