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Penelope Wilson——Works at the Environmental Action Group, Lives in Amsterdam, Netherlands.
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 >>+119962023-04-24 02:41:00
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