Can someone identify this rock?

Reply Mon 1 Jul, 2019 03:20 am
Hi, while on a vacation to the island of Maui, I came upon an extremely smooth black rock floating about 300 feet from the shore of Lahaina. It floats in a normal cup of water. I figured it might be a deformed shell of some sort, but either way I cannot find another example after google searching my head off. It looks nothing like pumice or scoria, at least of the examples I’ve seen. Here’s a quick image of the rock in question.

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Reply Mon 1 Jul, 2019 03:39 am
I scored into the “rock” to reveal brown dust. Could this be a piece of wood? Maybe even a nut of some sort?
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Reply Mon 1 Jul, 2019 04:46 am
If it floats it’s probably not a rock. I would vote for a nut of some kind.
Reply Mon 1 Jul, 2019 03:51 pm
It does look like its a nut more than any rock.
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