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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, 2018 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, 2018 by Weasel (58,940 points)

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