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Black Opal is a naturally occurring variety of precious opal mined in Australia
Calcite is the principal constituent of limestone and marble
increasing growth
where the stones are thought to have been originally found
Iolite 6mm Round A Grade - 15-16 Inch gemstone-pendant Black Opal is a naturallyIolite 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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