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Post by Drummond Island Rocks on Aug 26, 2014 20:25:28 GMT -5
I finished a batch of all Michigan beach rocks a couple weeks ago and did not post them but I was looking through them today and thought this one was cool. I normally would not have put any fossils in the batch but my kids must have picked this up with the other beach stones. I guess I'll classify this as an accidental success. Its very three dimensional where the grit ate away the matrix and left the coral fossil intact. Chuck
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junglejim
spending too much on rocks
Member since January 2014
Posts: 344
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Post by junglejim on Aug 26, 2014 22:03:55 GMT -5
Very nice accident, that's cool!!
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Post by nowyo on Aug 28, 2014 23:46:49 GMT -5
That's neat. Accidental success. I like it.
Russ
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Post by rockpickerforever on Aug 29, 2014 0:38:25 GMT -5
I love this! So cool, Chuck. The undercutting definitely adds to the fossil, neat.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 29, 2014 8:59:44 GMT -5
Some limestone has a lot of silica in it, basically chert. Looks like limestone till you hit it with a hammer and it breaks like glass. Or tumble it and it is slow to grind. That white coating on my coral wears fast to a point, then it changes to a high silica zone and is like white chert. I wonder if you tumbled say that chain coral in 1-2 inch pieces with small smalls if you would increase the under cutting between the chains in the rotary.
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Post by Jugglerguy on Aug 29, 2014 9:26:10 GMT -5
You can soak that in water with a little bit of muriatic acid and it will eat away all the matrix, leaving only the chain coral. I did a piece, but then dropped it and it shattered. If you decide to do a piece, grind the bottom flat first and coat it with something like polyurethane. That will give it a flat bottom to set it on.
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mibeachrocks
starting to spend too much on rocks
Member since September 2013
Posts: 198
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Post by mibeachrocks on Aug 29, 2014 9:44:46 GMT -5
Very cool. I was worried about tumbling chain coral. nice to see that you can do it.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 29, 2014 11:01:27 GMT -5
Tumblers great fro doing the unordinary. A pencil factory near by extrudes and cuts to length pencil erasers. Then dry tumbles them in 55 gallon drums.
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tkvancil
fully equipped rock polisher
Member since September 2011
Posts: 1,546
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Post by tkvancil on Aug 29, 2014 11:27:40 GMT -5
Cool!
Gotta try the acid thing on a couple pies I have.
Glad you showed this.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,666
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Post by Fossilman on Sept 2, 2014 9:27:52 GMT -5
Now that's nice!
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Post by rockpickerforever on Sept 3, 2014 15:10:50 GMT -5
I know it hasn't changed, but I keep coming back and taking another look at this. It's astonishing!
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Post by Drummond Island Rocks on Sept 3, 2014 20:27:38 GMT -5
I know it hasn't changed, but I keep coming back and taking another look at this. It's astonishing! Thanks! It is in interesting little bugger. You enticed me to post a picture of another one we found last weekend but its a tad too big to tumble forum.rocktumblinghobby.com/thread/67425/neat-chain-coralChuck
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Post by tandl on Sept 9, 2014 14:17:27 GMT -5
Way cool !
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