/r/whatsthisrock

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What is this? I think I picked it up in Dubrovnik, Croatia (almost certain)

2 upvotes • sritanona

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Is this a metal sponge

2 upvotes • Background_Baker_789

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What is this?

2 upvotes • a12_o1

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What is this?

2 upvotes • IcyGanache4610

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What has created these patterns of small dents and holes in this rock?

2 upvotes • carnivoreunicorn

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I would absolutely love some assistents on identifying this:)

2 upvotes • Lost_Swordfish_2543

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What the heck are these? Found at work in the Coquihalla River, after an excavator ran then over. Founds on multiple job sites in our area. Thanks! (Near Hope, BC)

2 upvotes • Prestigious-Pay1694

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Found at the bay- south NJ

2 upvotes • GarlicBreadBreath

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Help identifying this “formerly” yellow mineral

2 upvotes • Zealousideal_Tooth88

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River rock

2 upvotes • 45fhosstrum

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
What is this? I think I picked it up in Dubrovnik, Croatia (almost certain)	2	sritanona
Is this a metal sponge	2	Background_Baker_789
What is this?	2	a12_o1
What is this?	2	IcyGanache4610
What has created these patterns of small dents and holes in this rock?	2	carnivoreunicorn
I would absolutely love some assistents on identifying this:)	2	Lost_Swordfish_2543
What the heck are these? Found at work in the Coquihalla River, after an excavator ran then over. Founds on multiple job sites in our area. Thanks! (Near Hope, BC)	2	Prestigious-Pay1694
Found at the bay- south NJ	2	GarlicBreadBreath
Help identifying this “formerly” yellow mineral	2	Zealousideal_Tooth88
River rock	2	45fhosstrum