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Any ideas of what this is?


angeb20

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I found this yesterday in a field in Southern Central Minnesota. The field borders a prairie pothole lake. I also found a small shell impression in a sedimentary rock there in the past. In the photos there are 2 like impressions that continue around the piece. Appreciate your thoughts. Thank you.

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Welcome to TFF!

Can You retake the 3rd picture under better light?

Does this "fizz" when You put a drip of vinegar? If yes, what part(s) fizz?

 

I think it is calcite veins with limestone.

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On the smooth areas it does fizz with vinegar. Here is a hopefully better picture although it is the more grey/white color than the yellowish the sun shows. Thanks!

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The rough part scratches easily with a knife. So, you think that this was a calcite material that settled into a space between a different kind of rock that created a strange pattern?

(in a novice nutshell) :) 

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The rough part looks like it could be gypsum.

"Don't force it, just use a bigger hammer"

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A very interesting shape. Looks geologic to me too though.

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2 hours ago, angeb20 said:

The rough part scratches easily with a knife. So, you think that this was a calcite material that settled into a space between a different kind of rock that created a strange pattern?

(in a novice nutshell) :) 

That is correct. Looks like a piece of a giant 'thunder egg' i find. Definitely calcite filled void. 

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3 hours ago, angeb20 said:

The rough part scratches easily with a knife. So, you think that this was a calcite material that settled into a space between a different kind of rock that created a strange pattern?

(in a novice nutshell) :) 

Limestone (grey parts) is a calcium carbonate. It is easily dissolved by acidic groundwater, leaving voids that can be filled with other minerals. These minerals can be layered (like a cake), and partially or wholly fill the void.

Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

My Fossil collection - My Mineral collection

My favorite thread on TFF.

 

 

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Do you think this find is along the same theory? Possibly a rock or petrified wood outer surface filled with a caked sediment.... (found along the same small lake)

Thanks again :) 

 

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This looks more like a metamorphic sandstone called quartzite.

Would like to see some close up pictures of different areas.

Also- does it fizz? Can You scratch it with a knife?

Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

My Fossil collection - My Mineral collection

My favorite thread on TFF.

 

 

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I'm thinking of a partial septarian nodule for the first specimen, considering the double-wall structure.

 

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1 hour ago, ynot said:

This looks more like a metamorphic sandstone called quartzite.

Would like to see some close up pictures of different areas.

Also- does it fizz? Can You scratch it with a knife?

 

The outside of my 2nd piece is very hard and the inside is a much softer material like it settled there. I will try for closer pics, my camera hates close up pics though. I think I agree on quartzite.... 

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