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The different colored zones in the stone result from different oxidation states of iron
and sometimes polished
Obsidian is formed when felsic lava cools without crystal growth
It's a popular species found in warm
tourmaline and other minerals
Iolite 4-7mm Faceted Rondelle - 18 Inch new02242022 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.
