mooresean68
having dreams about rocks
Member since February 2018
Posts: 52
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Post by mooresean68 on Jan 6, 2019 23:14:00 GMT -5
My parents had found a small stash of rocks my 2nd great uncle had (he was a lapidary guy in his retirement back in the 70s) Anyone seen the likes of this one before?
And a couple/few nice sized agates in the batch, maybe 5 lbs of rocks all told.
This one really glows
Likely run this last one through the rotary tumbler, not sure about the first two though
Thanks -Sean
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Kai
spending too much on rocks
Member since December 2018
Posts: 331
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Post by Kai on Jan 7, 2019 0:20:43 GMT -5
Regarding the first one... my guess would be fossils (possibly shells) in sandstone.
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Post by aDave on Jan 7, 2019 0:56:07 GMT -5
^^^^^Agree with the above in the first is probably fossils. Scratch the others to test hardness before tumbling. Don't tumble the first one.
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Post by pauls on Jan 7, 2019 0:57:07 GMT -5
Agree about fossils
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Post by Pat on Jan 7, 2019 1:03:55 GMT -5
Fossils. I think the rock has a name. Forget.
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Post by Peruano on Jan 7, 2019 7:49:21 GMT -5
The first four (not the yellow one) all could easily be from the beaches around Guaymas, Sonora, Mexico. The white streaks in the first are indeed cross sections of bivalves embedded in sandstone or ? The next three are probably rhyolites with a white agate like inlay which I've never quite figured out, but it sometimes polishes well but tends to undercut a bit in the vibe tumbler. These can come out looking like satellite weather maps from space. Cut or tumble them all if you want to explore.
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Post by fernwood on Jan 7, 2019 8:43:48 GMT -5
Tommy, what is the fossil rock called? Sorry, I forgot the name.
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Post by toiv0 on Jan 7, 2019 9:40:18 GMT -5
Tommy , what is the fossil rock called? Sorry, I forgot the name. are you looking for the name "devils toenails"
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Tommy
Administrator
Member since January 2013
Posts: 12,911
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Post by Tommy on Jan 7, 2019 10:38:55 GMT -5
Tommy, what is the fossil rock called? Sorry, I forgot the name. Hi - what I have has never had a firm name attached to it as far as I know. Some have said that it's collected along the California coast line - others have said that it's from Colorado. I originally started calling it "fossil shells in mud" but that had negative connotations and never sold a piece until I changed it to simply "fossil sea shells in petrified ocean floor." forum.rocktumblinghobby.com/thread/83476/cutting-fossil-shells-mud-adviceOne thing I do know is it is definitely not close to being the same as the material called devils toenails (coquina?). That stuff has much smaller patterns and is very hard. The clamshells in petrified mud that I have can be 2 inches long and it's all very soft - to the point where the shells break and the mud runs away making it difficult to make cabochons without breaking. mooresean68
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,711
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Post by Fossilman on Jan 7, 2019 11:21:48 GMT -5
Yuppers, clam shells in a mud rock... See them all over the coastlines...
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mooresean68
having dreams about rocks
Member since February 2018
Posts: 52
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Post by mooresean68 on Jan 7, 2019 21:54:05 GMT -5
Thanks all! I can "see" the clam shells in some of the lines now. Certainly eager to get big yellow rolling!
-Sean
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