What is this thing?

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[Challenge-Solved] glass egg thing (lemmy.world)

submitted 8 hours ago* (last edited 1 hour ago) by Landless2029 to c/whatisthisthing

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[–] [email protected] 7 points 3 hours ago

A tracer pebble, interesting. But they seem to be rather made of the same pebble they are supposed to trace. https://southerncoastalgroup-scopac.org.uk/tracer-pebble-studies/

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