I found this in Mesa County, associated with a mudstone formation. I don't know rocks too well, but it seems like a chert sandwich. Seems kind of familiar, like I may have seen something
like this outside of Colorado.
Anyone know for certain what this is and possibly some geological insight on such a formation?
Thanks for any help!
Hard to tell from a picture but it looks like Calcite.
Have you done streak and hardness tests?
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