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Post by sitnwrap on Oct 23, 2008 11:51:38 GMT -5
I found this little natural beach tumbled pebble. I got excited thinking it was Ocean Jasper or something like it even though that doesn't occur in MA Then I took a real close up shot with camera and jewelers loop. Looks almost like little critters bore through the rock. Either that or the rock has really bad acne. Does anyone have an idea of what this might be? Thanks for looking
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Post by stonesthatrock on Oct 23, 2008 12:18:59 GMT -5
looks like ringworm to me......call a dr. lmao
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Post by sparkles on Oct 23, 2008 13:55:01 GMT -5
I like it! What a cracking beach pebble! The patterns are beautifully defined and the colours are cool. I think that is going to be fabulous when you polish it up! I'm a beach hunting fan myself and I can honestly say that I've never found such a cool spotty rock on one of my beaches! My guess is that it's a form of Orbicular Rhyolite, sometimes called Spherulitic Rhyolite. If so - then you were very close with your OJ guesstimate! The main difference is that OJ is Agatised or Silicified, and the conditions in Madagascar caused the fabulous spectrum of colours we know and love. Rhyolite is common, spotty Rhyolite is not, and is a sought after stone in it's own right. I LOVE collecting beach rocks, but a word of warning - just check the patterns run all the way through, often, beach pebbles will bleach or stain, sometimes both. And the action of pounding around in the surf with the other pebbles causes a frosty crust to form in the surface of the stone which hides it's true nature. You found a corker Buddy! Can't wait to see what you do with it! Will you tumble it up for us? (please) Cheers, Sparkles.
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Post by sitnwrap on Oct 23, 2008 23:02:31 GMT -5
Sparkles, I'm beginning to find a few things on the beach in Massachusetts that aren't suppose to be there or so I thought. I don't tumble but dream of the day I have my own cabbing machine, then I'll shine it up.
lol! "looks like ringworm to me......call a dr. lmao" had I not first shown a pick of the pebble, the close up could have been mistaken for just that.
Shoot, that would have been a good contest ;D
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pebblepup
has rocks in the head
Succor Creek Thunder Egg
Member since July 2008
Posts: 515
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Post by pebblepup on Oct 29, 2008 12:46:37 GMT -5
It looks like some Petoskey stones that I have. Petoskey stones are a petrified coral commonly found along the shores of Lake Michigan and Lake Huron.
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Oct 30, 2008 12:14:17 GMT -5
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Nov 9, 2008 13:33:07 GMT -5
I have some exactly like that from my "locally" colected material. And since mine was found with some other definite orbicular rhyolites, I just call it the same. Its an orbicular something anyway.
Shannon
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Post by sitnwrap on Nov 10, 2008 0:07:45 GMT -5
drjoe, I don't know how I missed your reply but a big thank you. My husband picked up a grinder for free this past summer and its a good one with the two wheels. I'll start getting the stuff you listed. I'm dead serious so once I get all the stuff listed. I'm going to shout out for advice.
My first questions. will this be too messy to use in a finished basement? Part of the basement is tile flooring.
I am asuming that the water bottle sprayers are to keep the stones wet as they are being cabbed. Is this correct? and if so, do I just spray the wheel?
I think I need to check the make and model of the grinder I already have and make sure the arbor adapter will fit it. is this correct or are arbor adapters universal?
I think those are my only questions for now.
Again, thank you for your reply.
Shannon, what ever it is, I've been finding more rocks with orby patterns. I don't think ryolite or coral for that matter is listed as being found in Massachusetts but then again, it is a beach with an open coast line so I guess anything is possible.
Lori
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Nov 12, 2008 14:23:27 GMT -5
Nope, the water bottle is for keeping the abrasive surface wet which in turn keeps the contact area / stone cool and washes away the grindings/grit. If you want to make a drip system it's not any harder and it's constant. Make sure all shaft sizes are compatible (or that you can use adapters (bushings) with). The arbor adapter should give you enough clearance if you want to get an expanding wheel and and use SiC or diamond belts. (having several arbor adapter with things already mounted makes for faster changes too). All this can come at a later date if planned properly. How about a pic of your buddy's grinder, so we are talking apples to apples? I forgot to ask if you and/or your buddy are handy (I usually ask if you would hurt yourself with a picture of a screwdriver or not ) Dr Joe .
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Post by sitnwrap on Nov 12, 2008 16:23:44 GMT -5
drjo, I have pics and will start a thread in the Home made equipment section.
Please take a look. If it can be built, hubby can build it.
Thanks
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