I found these today rockhounding near a hot springs......any idea what these are. this newbie could use some help. They look lavariffic.
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Here's another about the same size 6"x6"
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These 3 were found next to each other. small pieces.
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these last 2 pics are same rock different angles
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I can't tell whats goin' on here. A harder agate like material on top of the softer green. and what is that swirl?
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Cool finds GB. I have no idea what you have there. I bet ol johnny (astrobleme) could tell ya though. Being a cut-em-up freak you know what I'd do. Shhhhh!! don't tell Denise!

Could it be calcareous sinter, also known as tufa? C

Very cool specimens! Almost fossil looking to me but really hard to tell from pictures.
Have you done a hardness test on it yet Jeff? That always help to narrow it down and eliminate other possibilities.



Dont think there is a rock you wouldnt cut up Jim.

It just looks like there is some cool patterns in those pieces. Unless it is something thats a rare find I'd still have to see what the inside looks like. Come on Denise....a small flat spot would make a good base.

Cool finds GB.
I think Chad was real close on this one. While searching calcareous sinter which Chad put in, I found siliceous sinter which gives a redirect to Geyserite.

I'm thinking it's the Geyserite which is known to be found around hot springs as well.

For more info on Geyserite check out the wiki page Geyserite

Don't have any idea why or what the green swirl is but it's neat.

CP

Looks cherty to me.

Hey CP, after reading your post I would agree that it looks silicified. Also, in the last pic, it looks opalized too. Interesting stuff. C