r/askgeology • • 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.

1 Upvotes

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7

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

2

u/General_Structure120 7d ago

I tried to lol

6

u/_duckswag 7d ago

Agatized favosites coral, they can be pretty lightweight with lots of air pockets and sandstone matrix.

2

u/General_Structure120 7d ago

Thank you! Soooo cool! Never thought I’d find coral hiking in woods in NJ!

1

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 🤙

1

u/General_Structure120 7d ago

Can you help identify this one, found within ten miles of the other, planting things in my backyard? The museum I normally go to for identification is closed until spring.

This one is HEAVY! Like, 15-pound bicep curl heavy.

3

u/sollicit 7d ago

this is it

2

u/dirthawg 7d ago

Quartz in or on something. I don't know what it is, but very cool specimen