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Colorado Prospector - Gem and mineral prospecting and mining forums _ Prospectors and Rockhounding Field Work _ What is this?

Posted by: Goldlane Feb 1 2017, 11:35 AM

I found this in the river yesterday when I was classifying. Not really sure what it is?

Posted by: Goldlane Feb 1 2017, 06:27 PM

And this?

Posted by: Dave S. Feb 3 2017, 09:31 AM

At this point I don't even have a good guess Goldlane.

Any more info on these? Where were they found? (general area)

They look cool!

Posted by: Goldlane Feb 3 2017, 03:12 PM

QUOTE (Dave S. @ Feb 3 2017, 08:31 AM)

At this point I don't even have a good guess Goldlane.

Any more info on these? Where were they found? (general area)

They look cool!

Dave S., I found them in the Arkansas river in Lamar, CO. I was digging for gold and found these. O thought they were interesting but have no idea what they are. I did find a lapidary as well.

Posted by: Denise Feb 3 2017, 04:08 PM

Cool rocks! Is really hard to tell by just a pic but when I looked at the first one I thought Epidote mass with Quartz because of the green and white bands.

Just a thought not a for sure.

Posted by: Gene Kooper Feb 3 2017, 07:11 PM

Just an impression, but it looks like a sea sponge or coral where the carbonate has been replaced with chert. Geologists luv polysyllabic words so they would call it chertification.

Does the rock ring like a bell when tapped by a hammer?