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Kyanite is also extremely useful in industrial applications due to its high heat resistance
Red Agate purportedly enhances mental function
Mixed Lodolite is Quartz with inclusions of sand
Tiger Eye is a macrocrystalline Quartz stone with bands of rich golds and browns
Iolite 4mm Round A Grade - 15-16 Inch australian Kyanite is also extremely usefulIolite 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.