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This is very light and I'm almost 100% positive it is lava from Mount Vesuvius I got 50 years ago.
Does it have a name?
Sintered pumice, I suspect.
Would need to inspect microscopically in thin scetion to be sure, or at using a least hand lens.
The pieces should contain remnant gas bubbles, and the pieces should be stuck to each other through their being still-hot and tacky when they settled.