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I found it on the sea shore, its translucent, mainly grey, do you know what this might be?
Thanks a lot
Well it certainly looks like micro/crypto-crystalline banded silica (probably chalcedony), so I think the term agate is applicable!
It would be nice if you could get it cut and polished, so you could see the fine banding better.
(Not necessarily for us on this forum, but for yourself primarily.)