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The different colored zones in the stone result from different oxidation states of iron
resulting in fossils that are chalk-white
It occurs with wave-like bands of charcoal gray
Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks
Iolite 8mm Round - Large Hole Beads 48hr_12242024 The different colored zones inIolite 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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