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Post by superioragates on Oct 22, 2010 19:52:24 GMT -5
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Post by jakesrocks on Oct 22, 2010 20:06:11 GMT -5
Marie, a pic before you cut it might help with id. The green jell sounds like it could be some sort of lichen or moss.
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Post by superioragates on Oct 22, 2010 20:55:20 GMT -5
Oh yeah....I might add that this rock is HEAVY too!!
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Post by jakesrocks on Oct 22, 2010 21:25:19 GMT -5
The green looks more mineral than plant. What kind of hardness are we talking about ? The darker brown leads me to believe it has some iron content. Cut, it might be loaded with dendrites.
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Post by superioragates on Oct 22, 2010 21:42:11 GMT -5
I have scratched tested it, tho I am not all that experienced here, we used a pocket knife on the green....nothing, but used an agate to try & scratch it, and it "scuffed" it. The white area scratches with an agate. The darker areas are HARD. Last year, i took the dremel to it, I dont remember what was what, but it seemed to me the green was soft...maybe I am remembering wrong. I will cut it tomorrow, and see what happens with it.
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Post by jakesrocks on Oct 22, 2010 21:49:35 GMT -5
Some of the white areas look like they have dendrites. May be some interesting material. If you can get sone slabs of the green material, they might also cut interesting cabs.
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Post by tandl on Nov 1, 2010 9:05:18 GMT -5
The green looks like the metamorphic rock called greenstone . The white looks like caliche with iron .
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Post by superioragates on Nov 1, 2010 9:49:36 GMT -5
Ok, so I looked up greenstone, which also led me to schist. I read them, dont understand a lot of it, but, my location is not listed there, so finding this is probably just a freak accident. right? I haven't seen any others down there like this, just this one, and according to what I read, greenstone is found in "belts"......I think next time I go looking I will keep my eyes more open to see if I see anything else like this, out of curiosity. I did start to cut it, but my blade on the WF died....which dont surprise me after all those agates I cut...but I will get it cut. I got 1 section of the green cut off before the blade died, so I may try to cab some of that some time this week. Thanks for the info!!!! It makes some sense, just because there is TONS of granite down here, the stuff is everywhere! Marie
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Post by tandl on Nov 1, 2010 11:37:49 GMT -5
There is a couple belts in Ontario and Quebec Canada . There is the Ely greenstone belt in northern Minnesota . I find greenstone here in central Illinois ,quite often . They were brought down by glaciers . Some are attractive , some not , they do vary a good bit ,being metamorphic .
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Post by Hard Rock Cafe on Nov 1, 2010 12:19:29 GMT -5
I'm guessing stromatolite, but I'm not confident. If it's heavy, that would imply iron to me. And yes, glacial transport is likely since you found it in a gravel pit.
Fun rock, regardless! I'm eager to see it cut.
Chuck
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