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Post by snowmom on Nov 14, 2014 7:45:44 GMT -5
Think this is one of the best yet. I have not a clue if it is shattered rock breccia from meteor impact or if it is some sort of identifiable known rock type.
anxious to get it cut so I can see if it is at all translucent. That would be cool. I shined a flashlight on it but it doesn't look like it will be. : ( In spite of appearances on one end I think it is a pretty solid piece, extremely dense and should polish up a storm!
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Post by mohs on Nov 14, 2014 11:43:10 GMT -5
this is wild theory of yours snowmom meteorite glass scatter I like it --I like it a lot Ed
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,681
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Post by Fossilman on Nov 14, 2014 18:36:07 GMT -5
Cut,cut,cut,cut!
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Post by snowmom on Nov 14, 2014 18:39:57 GMT -5
making arrangements Mike, if plan A falls through you will be plan B LOL!
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Deleted
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Post by Deleted on Nov 15, 2014 22:56:56 GMT -5
Occam asks "Why can't it be granite or gabbro? Those are far more common than impactites."
I have to agree it looks very much like granite or gabbro.
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Post by snowmom on Nov 16, 2014 7:19:31 GMT -5
thanks, Master Shotgunner, I'll learn this stuff yet. I appreciate the input. Much of the rock components don't seem like crystals, one color is set inside another and they are swirled and blobby.. I have been interpreting granite to be stuff looking much more like the usual stereotype picture of granite, with actual crystals with flat planes, each clearly discernible from the other... I can see there are some here, but a lot of them don't fit my understanding of crystal... is a crystal still a crystal when it is melted? Is it granite if I can see any crystals at all, regardless of what else is in it? I guess I need to go back and study all the definitions of granite, I don't seem to be spotting it. thank you. (signed, grasshopper)
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Deleted
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Post by Deleted on Nov 16, 2014 22:42:05 GMT -5
Fair warning: This is a trick question. I see your stone and I own this one: I value your opinion. I see the crystals are similar in both stones. Do you agree? Wanna take a stab at identifying my rock? Diagnostic Characters: It's heavy in the hand (dense?) Does not scratch with a knife. Does not scratch with agate. Does not react with hydrochloric acid. [cheater's characteristic = is polishes like glass]
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Post by snowmom on Nov 17, 2014 6:36:26 GMT -5
I suspect you will tell me it is granite? point made. thank you
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Deleted
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Post by Deleted on Nov 17, 2014 11:58:40 GMT -5
I too would have called it granite. But, alas, the plot thickens. I bought this rock from tandl and Ted knows his stuff. This is a large grained gabbro. Here is what the outside looks like. See the resemblance?? This is also glacial erratic collected in Iowa, or perhaps Illinois, I forget where Ted lives. I'd love to see the inside of yours!!
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Post by snowmom on Nov 17, 2014 13:42:23 GMT -5
interesting, yes I see why gabbro. I think yours has more white on it but they do look similar. indeed the plot thickens. thanks Shotgunner!
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Deleted
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Post by Deleted on Nov 17, 2014 13:44:48 GMT -5
mine had no white outside before I cut it. the color inside was a total surprise.
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Post by snowmom on Nov 17, 2014 14:20:48 GMT -5
now I'm feeling impatient.
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Post by jakesrocks on Nov 17, 2014 14:24:01 GMT -5
I'm voting for Youtellmeite. It just has a nice ring to it.
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Post by snowmom on Nov 17, 2014 16:34:33 GMT -5
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Post by Jugglerguy on Nov 17, 2014 17:07:13 GMT -5
Bring it over tomorrow. I think I'll have time to cut a slice off for you.
Rob
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Deleted
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Post by Deleted on Nov 17, 2014 18:01:03 GMT -5
You are splitting hairs in separating Norite from Gabbro. From wikipedia and My piece does have olivine and is definitely lacking labradorite that is described as found in Norite. Can't wait to see Rob's slice!
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Post by snowmom on Nov 17, 2014 18:07:39 GMT -5
Rob, great! the suspense Is killing me! call me when you have the saw warmed up thank you!!!!!
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Post by snowmom on Nov 17, 2014 18:12:10 GMT -5
I'm pretty sure this one doesn't have labradorite either, unless it is well hidden...but the olivine is there. didn't realize it was splitting hairs, thought it said it was a 'sort of' gabbro... must have misunderstood. going to go back and read it again. just noticed the photo looked like it when I did an image search and it said it was found in Canada where safely the majority of our glacier imports seem to come from. stay tuned for the next exciting chapter: Jugglerguy to the rescue! (William Tell overture playing in the background as the screen fades)
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Post by tandl on Nov 17, 2014 21:19:42 GMT -5
looks like gabbro . the staining on the outside is from iron . gabbro`s do vary in grain size . so do most igneous rocks . Yours looks very similar grain size. i have several different variants . i also have found sudbury onaping and green melt glass here in central illinois. the glaciers brought them down. i have rocks traced clear up to hudson bay canada that the glaciers brought down . i do not know exactly where the gabbro came from . some rocks will be untraceable because they dont exist in their place of origin ,because of the mile high bulldozer that pushed them all down here and scattered them out . mountains and whole rock formations where just wiped away!
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Post by snowmom on Nov 18, 2014 8:08:05 GMT -5
Tandl, I lived in central IL, too, McLean co, at the edge of the Bloomington Moraine for many years. This was where the glaciers stopped advancing and started to retreat, so that area is extra rich in glacial transports. The moraine itself is over a mile high, and the ice that was over it at one point at least that high... bulldozer indeed! What part of central IL are you? Which river is in your Icon photo, the Sangamon maybe? Fox? Illinois? I found lots of interesting stuff while I lived in IL (most of my life in one place or another all over IL) but in those days it was just pretty rocks for the rock garden. Not much time for anything else. Now I'm retired I can dig in and study. I appreciate the input!
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