jamesp
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Post by jamesp on Aug 31, 2014 10:10:09 GMT -5
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Post by Pat on Aug 31, 2014 10:24:42 GMT -5
I've never seen streaky-striped unakite. Verrrrry nice! All I've seen is green with orange dots.
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Post by mohs on Aug 31, 2014 11:40:52 GMT -5
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Post by mohs on Aug 31, 2014 11:50:32 GMT -5
where was that rock hounded? that is such good stuff!
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jamesp
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Post by jamesp on Aug 31, 2014 11:55:08 GMT -5
I remember your unakite heart Ed. It was a classic Edheart. And sure looks like unakite. Pretty plate of stones by the way.
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jamesp
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Post by jamesp on Aug 31, 2014 11:59:02 GMT -5
where was that rock hounded? that is such good stuff! I think Rob finds his fabulous Robakite on Lake Michigan Ed. On the beautiful pebble lined beaches. I think he brings his kids to collect the best.
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jamesp
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Post by jamesp on Aug 31, 2014 12:03:00 GMT -5
I've never seen streaky-striped unakite. Verrrrry nice! All I've seen is green with orange dots. I was surprised at this fine material Pat. I had tumbled fine imported unakite as a kid. It was nothing like this. Check out the shear variety of Rob's unakite. "Robakite"
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Post by gingerkid on Aug 31, 2014 12:11:37 GMT -5
I've never seen streaky-striped unakite. Verrrrry nice! All I've seen is green with orange dots. Me, either, and it sure has wow-factor! Very nice 'Robakite,' jamesp!! I like the patterns in the 2nd one, too.
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Post by mohs on Aug 31, 2014 12:41:43 GMT -5
Rob is jugglerguy right?
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jamesp
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Post by jamesp on Aug 31, 2014 12:58:26 GMT -5
Yes Ed, Jugglerguy. If you want the slab in the first photo I will send it to you. I got several of those. And I called Rob's son to put the best unakites in the box when Dad wasn't looking not really. Here is a dry Unaball. I will be the unaballer for a while. it is an enlarged replica of my wife's dog's brain Doe Doe. Doe doe loves her more than I. Wet, dog starting to worry
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Post by mohs on Aug 31, 2014 13:02:48 GMT -5
Thanks James
nice marble
question does that unakite originate there in Michigan? or was it dragged there by a glacier?
I would suppose that rock grows in massive form?
from all my Phoenix hounding the piece I found is fairly rare I'm sure it didn't originate from area it was found
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jamesp
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Post by jamesp on Aug 31, 2014 13:21:56 GMT -5
It was discovered in North Carolina. Typically found in worn down mountains and bulldozed by glaciers. Not typically around Arizona. I think it is formed in mass like granite. Believe it is quartz epidote and felspar. pink = felspar green = epidote ??
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Post by Jugglerguy on Aug 31, 2014 13:56:40 GMT -5
That unakite is all from Lake Superior, not Lake Michigan. I live near Lake Huron and find a little unakite here, but it's thick in Lake Superior. I'm not sure where it originates since there is a lot of glacial rock there.
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Post by Jugglerguy on Aug 31, 2014 13:58:29 GMT -5
James, don't tumble the Petoskey stones, they'll disappear.
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jamesp
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Post by jamesp on Aug 31, 2014 14:52:36 GMT -5
James, don't tumble the Petoskey stones, they'll disappear. Ghost rock. I will put them in with a load of coral at 200 RPM.
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Post by 150FromFundy on Aug 31, 2014 15:11:14 GMT -5
Your rocks have been altered, by metamorphism that is. They must have been collected along a contact zone. The first one may have been Unakite once, but the once granular appearance has been melted and stretched into layers. Those layers were then cracked and fused with possibly quartz.
The second one looks like classic granite, but has been fractured and injected with a stripe of Epidosite.
The third one looks brecciated, cracked and re-fused together.
Neat stuff. The black material in the granite-like rocks may tend to be softer than the surrounding material and may tend to undercut.
Darryl.
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Post by Jugglerguy on Aug 31, 2014 15:23:59 GMT -5
Darryl, you're right about the undercutting on the granite rocks. There are a lot of those granite like rocks and the stuff like the first one is a little harder to find.
You say the first rock was once unakite, so what is it now? Isn't it still unakite? This stuff looks a lot different from unakite from other places. The Rock Shed sells unakite from Brazil that doesn't look anything like the Lake Superior stuff. However, the Michigan rock hounding books all have pictures of the stuff I find and call it unakite.
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tkvancil
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Post by tkvancil on Aug 31, 2014 15:42:02 GMT -5
I find the same rock here in Illinois occasionally. Never any thing larger than say a golf ball. My favorite self collected rock to tumble, the red and green are so cool, especially the ones with the green veins. I'm guessing they're glacial till.
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jamesp
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Post by jamesp on Aug 31, 2014 22:00:24 GMT -5
I will saw some more and post the slabs as I go. Cool discussion. The metamorphic effects makes it more attractive than some imported unakite I have seen. The healing was very solid and looks like quartz. The first specimen is my favorite.
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jamesp
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Post by jamesp on Sept 1, 2014 3:49:34 GMT -5
Your rocks have been altered, by metamorphism that is. They must have been collected along a contact zone. The first one may have been Unakite once, but the once granular appearance has been melted and stretched into layers. Those layers were then cracked and fused with possibly quartz. The second one looks like classic granite, but has been fractured and injected with a stripe of Epidosite. The third one looks brecciated, cracked and re-fused together. Neat stuff. The black material in the granite-like rocks may tend to be softer than the surrounding material and may tend to undercut. Darryl. You got me looking at images of unakite Darryl. This material has had some serious manipulation. Looking closely, a lot of brecciation. And other forces you mentioned that are beyond my understanding, but clearly visible alterations have occurred. I had been admiring Rob's unakite tumbles for a while and noticed they were unique. Tried to google more info about Lake Superior unakite and came up empty handed. Lots of info about the formation of Lake Superior though.
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