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This is my first attempt at studying geology.

A year ago I found this stunning rock in the Maumee River here in Northwest Ohio. The rock is very smooth in texture, measures approx 2 cm, and was found in a bed of sand/mud/stones on an eastern river bend. It seems to have magnetic properties, but I see no oxidation indicating a presence of iron, which I imagined would be the most common reason being magnetic.

Picking up the rock with a magnet

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Location where I found it, showing direction of river, found on east side:

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closed as off-topic by user12525, Fred, arkaia, Semidiurnal Simon, Gimelist Sep 1 at 7:39

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    $\begingroup$ Can you describe the texture of the grains? What shape are they, are they interlocking or just touching? Also a location would be useful. $\endgroup$ – bon Jan 29 '18 at 8:15
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    $\begingroup$ Grain size differentiates mudstones, from sandstones, from conglomerates, a conglomerate has "grains" that are themselves gravel sized, i.e. larger than 2mm. $\endgroup$ – Ash Jan 29 '18 at 17:54
  • $\begingroup$ If a large number of pebbles like that were cemented together they would form a conglomerate $\endgroup$ – haresfur Jan 30 '18 at 23:25
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    $\begingroup$ Ah I see, yes it does not contain any large sediments, and the texture of the rock is very smooth to the touch. It was found on a river bend in Northwest Ohio. We have a lot of clay, slate, and fossilized animals around here. Sorry if this question was much too abstract to approach, I was excited to see that this rock was magnetic, and the appearance in person is almost gold/metallic flake! Beautiful rock. $\endgroup$ – Colin Laws Jan 31 '18 at 15:04
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    $\begingroup$ Should have made this clear. I'm not talking about what the rock feels like to touch but about what the relationship between the grains that make up the rock is. Do they interlock or are they touching with gaps in between? $\endgroup$ – bon Jan 31 '18 at 19:03