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Post by fernwood on Jul 14, 2017 8:47:04 GMT -5
I am finding a lot of corals and oolictic agates with these raised black “nodules” on them. They do not come off when cleaning. Most of the time they are magnetic, but not always. The ones pictured are slightly using a magnet that is one step down from a rare earth magnetic. Location is SE Portage County, WI. Was able to establish (with lots of professional help) that on my property was the Southwestern advance of the Green Bay Glacial Lobe. Also was the Eastern edge of Glacial Lake Wisconsin. Not too far from the ancient Miladore Volcanic Range. About 30 miles. Was told that many of the published maps are a very conservative estimate and that local research/finds have shown otherwise. A local geologist/professor, attributed many of my finds to the Niagara Escarpment, which has a visible portion about 45 miles to the NE of my property. When the glacier came through it carried many things from the escarpment with it and deposited them. Apparently, many ended up on my property. And, I am finding them in huge numbers. So, what does anyone think these black nodules are? Will these compromise the tumbling/cabbing properties of the stones? When I once again have lapidary equipment should I try to remove them or just see what happens? Anything else I should know? Also any ideas on the accepted name of the stone would be appreciated. Fossil coral? Jasper? Agate? This photo does not show a ruler, but it is about 3.5" by 1.75". Yes, way too many questions. But, the only “stupid” question was the one a person was afraid to ask. Thank you as always.
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Post by 1dave on Jul 14, 2017 10:41:10 GMT -5
My guess would be meteorites. tons of them fall every day, make up most of the "black sand" when panning for gold.
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Post by fernwood on Jul 14, 2017 16:31:59 GMT -5
I did find one potential meteorite here. Also have one that other searched for at my former residence. I found a small chunk when 12 years old. It fell in the 1920's. No One had found it. I rode my bike to the location and spotted it right away.
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goatgrinder
spending too much on rocks
Make mine a man cave
Member since January 2017
Posts: 368
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Post by goatgrinder on Jul 14, 2017 16:44:32 GMT -5
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goatgrinder
spending too much on rocks
Make mine a man cave
Member since January 2017
Posts: 368
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Post by goatgrinder on Jul 14, 2017 16:45:39 GMT -5
Looks like maybe hematite? Very common for hematite to cover minerals here in Georgia.
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Post by spiceman on Jul 15, 2017 12:28:39 GMT -5
A meteorite would be magnetic. Along with some granit but it's not granit.
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Post by 1dave on Jul 15, 2017 12:36:08 GMT -5
A meteorite would be magnetic. Along with some granit but it's not granit. But the tiny ones get embedded everywhere. it has been happening for 4.5 billion years.
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Post by fernwood on Jul 15, 2017 16:31:19 GMT -5
Hey thanks everyone.
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Post by Pat on Jul 15, 2017 17:18:54 GMT -5
What a lucky find!! I like little extra Sprinkles on rocks. Make a neat cab. Thanks.
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