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what is this rock?

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scratches my nail, seems to be sedimentary with fine grains. grayish color with no crystals. looks like there may have once been rings

asked Jul 11 by Caeynn (120 points)

1 Answer

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May contain any type of mineral carried in solution inside the husk of this rock. Resembles mostly fine sediment that has cemented itself inside. Like silt or alluvial flow forming a concretion.
answered Jul 12 by Weasel (55,690 points)

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