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Rainbow obsidian is an incredible stone. Born in the fires of a volcano, lava sometimes cools without any crystal growth, creating a translucent dark volcanic glass called obsidian. Occasionally, patterns of gas bubbles remaining from the lava flow align along layers in this obsidian, creating a fantastic rainbow effect that constantly changes in the light. No two stones are ever alike.
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It took me about 30 shots, but I eventually got a couple of good shots without too much reflection, showing the different colors that this stone flashes. I love rainbow obsidian. And I still have 4 or 5 more of these to set. Yummy.
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You can find this utterly delicious, one of a kind necklace in my shop.