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Rock Identification
Posted by: DitchDigger
Date: December 05, 2017 03:47PM
New to the group I thought I'd give it a try.

I've had this specific rock in my possession for probably 40 years (I'm 50) and I've never had it identified.

I brought it to work to see if my amateur geologist friend could identify it, but he only has a couple theories. In fact he ground down and polished the bottom to reveal some interesting rings.

I thought I'd try posting it to a group like this to see if anyone else can grant me some clarity.

Since it's been many years since I found this particular rock, I have no idea where I might have picked it up. I'm fairly sure I did NOT buy it at a gift shop but rather found it on the ground. I'm guessing I may have found it in California, Utah, Nevada or possibly Colorado. I just don't recall. Either way it's a mystery.

Take a look and let me know what you think.

The rock in the photos is approximately 1"x1"x.5"

I have more detailed photos, but their file size is too large for this forum. I can email upon request.

Thank you for your time.

Please see attached photos.




Re: Rock Identification
Posted by: Dave J.
Date: December 06, 2017 05:49PM
Calcite speleothem.

https://en.wikipedia.org/wiki/Speleothem


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Re: Rock Identification
Posted by: Champ Ferguson
Date: December 08, 2017 08:34PM
Do some hardness testing.
See Moh's scale if you aren't familiar with it.



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Re: Rock Identification
Posted by: DitchDigger
Date: December 12, 2017 12:22PM
Thanks for the info. It's what we thought it might be.

Re: Rock Identification
Posted by: connerchris99
Date: February 18, 2018 11:38AM
I think this is puddingstone. Anyone want to weigh in an opinion?




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