Iron-oxide concretions and nodules

Iron oxide mineral precipitates have various biomediated to

Iron concretions hi-res stock photography and images - Alamy

Concretion - Wikipedia

Nodules, Concretions, Other Interesting Rocks For Sale

Pin by Jillian on homeschool Rocks and fossils, Iron oxide

Ironstone nodule 3, Ironstone is an iron oxide-rich rock th…

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Iron-oxide concretions and nodules

Iron-oxide concretions and nodules, Some Meteorite Information

How should I go about getting these cleaned up? : r/rockhounds