Iolite 7x9-8x10mm Pebble A Grade - 15-16-Inch 8x10 Tumble Nugget Mica is a mineral name

Mica is a mineral name given to a group of minerals that are physically and chemically similar

being found in metamorphic and pegma

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It is the most abundant lithium-bearing mineral as well as a significant source of the rare alkali metals rubidium and caesium

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Iolite 7x9-8x10mm Pebble A Grade - 15-16-Inch 8x10 Tumble Nugget Mica is a mineral nameIolite 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.