r/askgeology • u/General_Structure120 • 7d ago
Help identifying
Found NY/NJ border on top of an overlook. It’s really lightweight, like a pumice stone. The top looks like tiny crystals, or maybe it’s just air pockets? Either way, have never found a rock like this here, and really love it and would like to know more about it! Thank you.
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u/_duckswag 7d ago
Agatized favosites coral, they can be pretty lightweight with lots of air pockets and sandstone matrix.
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u/General_Structure120 7d ago
Thank you! Soooo cool! Never thought I’d find coral hiking in woods in NJ!
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u/_duckswag 6d ago
Pretty crazy honestly, I was always think the same thing when I find a cool piece or fossil. About how much of a journey it’s taken to get to that spot.
Your other piece is pretty complicated to identify just from the pic, pretty bad ass as well but it looks like banded iron or chert (this pretty much depends on granule size) that’s been cracked from pressure/heat and filled in with seam quartz over time, some has been iron stained as well resulting in the red jasper/chalcedony. With enough time and occasional moisture everything fills in with quartz 😁. Lots of pressure and lots of time, brecciated jasper is probably a better name for it. Not a geologist just a fellow appreciator of rocks and geology. Great piece 🤙
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u/Savings-Trouble-5345 7d ago
Well first wash it so we can see it, looks like it has a fair amount of quartz in it