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Spinel is a hard vitreous magnesium aluminum oxide
7mm Beading Chain
which in many species is highly iridescent
Variscite is usually green
hackmanite is named for Finnish geologist Victor Hackman
Iolite 7x9-8x10mm Pebble A Grade - 15-16-Inch "Football" Spinel is a hard vitreousIolite 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.
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