Originally published at: https://boingboing.net/2017/11/02/geode-jigsaw-puzzles.html
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When its filled in like that it’s usually refereed to as an Agate, I believe.
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I love this company’s jewelry designs. My spouse has a couple of Nervous System necklaces
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When I was an anthropology undergrad at the University of Toronto many years ago, in one of the courses we each took a flint nodule (basically a ball of flint), smashed it, and had to put it back together again; a 3 dimensional puzzle. Reminds me of this. Although the flint looked more like swirls of caramel.
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