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Charlotte Perez——Studied at the University of Zurich, Lives in Zurich, Switzerland.
Flint, chert, jasper, and quartzite all have a hardness of about 6?. Granites are in the 6 range. Obsidian (volcanic glass) is in the 5 to 6 range. Any of these rocks are strong enough to generate sparks.read more >>+119962023-04-23 02:40:17
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