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Post by gr on Sept 30, 2010 11:06:57 GMT -5
have any of you seen these before? Ithink they fall into the agate catogory. Some are very patterend when cut open & others are plain nothing. I call em potatoe rocks and there are lots of them.
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adrian65
Cave Dweller
Arch to golden memories and to great friends.
Member since February 2007
Posts: 10,777
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Post by adrian65 on Sept 30, 2010 11:26:03 GMT -5
They look like flint nodules. Very hard material, and as you said some could have nice patterns.
Adrian
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,466
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Post by Sabre52 on Sept 30, 2010 14:42:54 GMT -5
Weird but very cool. I think they look better as they are than they would cut anyway....Mel
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Post by tandl on Oct 1, 2010 21:47:04 GMT -5
Geodized fossils in sediment , looks like mudstone .
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amyk
fully equipped rock polisher
I'm a slabber, I'm a cabber, I'm a midnight wrapper.
Member since January 2010
Posts: 1,331
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Post by amyk on Oct 2, 2010 16:55:44 GMT -5
yup. I've seen them. In Arizona (I know you are in arizona too, thats why you see them.) They are all over. Some kind of fossilizd sea life? I think. looks like rocks with teeth on the outside. If you cut them and get a pink, lavender, and white and maybe a bit of blue, it is a fossilized sponge on the inside. Takes a nice polish.
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