🔎 UNIDENTIFIED What is this slab concretion?

Thatguy51

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Jul 9, 2024
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My buddy was digging up a natural spring for a pond and has found several of these reddish orange sandstone/sedimentary rock slabs all about 5 to 7 inches thick and super heavy. This one in the picture is 4 foot by 3 foot and 5 inches thick. Would love to know what exactly it is and if they are worth anything.
 

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Welcome to Tnet.

Not 'Moqui marbles' I think, which are a particular kind of iron oxide/sandstone concretion... but botryoidal hematite.(and weathered).

Google both and you'll see the difference in form.
 

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