ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 11, 2016 18:17:35 GMT -5
Took a trip up to Peterson Park by Northport in Leelanau. I've never found an agate there before and didn't even know they could be found there. I was walking the beach and came across an actual agate. Brought it home and sliced it up a little. Below you can see some fortification. Held a slice up to the light. Same slice laying on the table. You can see the table through the window of clear agate. Another slice up to the light. Same slice on the table. In the center of this next pic is the uncut half of the rock. It doesn't really resemble the Lakers and Water Level agates found on Lake Superior. I can't say what it is actually called when found on Lake Michigan instead of Lake Superior. It isn't the prettiest agate ever found. But it is the prettiest agate I ever found on Lake Michigan. Oh yeah, the water there was so high the old beach line is under water and the old line of above the water rocks that used to be nowhere near the water are now the new beach line. Good thing is that the wave action has uncovered lots of Petoskey stones that used to be high and dry. Found a few nice round ones and a bunch of cutters where I will have to extract usable fossils.
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Post by adam on Sept 11, 2016 18:45:49 GMT -5
Idk but it's a NICE agate, score for sure.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
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Post by Fossilman on Sept 12, 2016 9:41:47 GMT -5
NICE! All the "Lakers" I have been given are a mixture of rock,and are just called "Lakers" because they come from the Great Lakes area...I just mix them in with the real "Lakers"....
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ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 12, 2016 10:01:25 GMT -5
NICE! All the "Lakers" I have been given are a mixture of rock,and are just called "Lakers" because they come from the Great Lakes area...I just mix them in with the real "Lakers".... I should have called them peelers and fortifications instead of lakers because that is what I was trying to compare it to. Of course, this one is a laker too I guess since it was found on one of the Great Lakes. I also picked up some petoskeys. The small oval one near the bottom left is only in need of a final polishing on 600 grit, then some 1200, then off to the buffing wheel. The big one near the middle has the most complete but unfortunately the lightest pattern of them all. The ones showing mud will be shaped and fashioned into maybe some Michigan shaped pendants and most mud removed hopefully.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,466
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Post by Sabre52 on Sept 12, 2016 10:52:21 GMT -5
Actually appears to be a thunderegg to me. Lake Superior does have T-eggs. Maybe Lake Michigan does too. Cool find!....mel
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ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 12, 2016 20:08:28 GMT -5
Actually appears to be a thunderegg to me. Lake Superior does have T-eggs. Maybe Lake Michigan does too. Cool find!....mel I have included a link that states Lake Superior thunder eggs are pea size and not much bigger and can only be found in one small area offshore and on it's accompanying beach and they don't resemble my rock at all. Most of the thunder eggs I've seen really don't resemble this rock IRL in any way. This rock has a fairly smooth exterior with visible signs of fortification and chalcedony on the outside. The end that I ended up cutting had a huge fortification right on the surface and that is what was being cut across in the slice pictures.The easily spotted by eye features like the surface fortifications are what attracted me to it and what made me pick it up. I'm pretty sure that if it would have looked like a typical thunderegg I would have walked right past it without a second glance since I wouldn't have seen it as an agate and especially because I was really there looking for Petoskey and not thundereggs. It would be really neat if it was a thunder egg. Has anyone out there found a thunder egg in Lake Michigan? If it is a thunder egg it's a weird one. I think it looks more like this which was labeled crazy lace agate. Looks more like the example on the top inside.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
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Post by Fossilman on Sept 13, 2016 9:42:13 GMT -5
Actually appears to be a thunderegg to me. Lake Superior does have T-eggs. Maybe Lake Michigan does too. Cool find!....mel See! We learn something new everyday! I did not know that they had T/E's in that area... Cool info!!
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 14, 2016 9:24:11 GMT -5
Yeah. Looks like an agete filled t-egg.
Study the larger ones more commonly seen and you will find similar ones , of different colors.
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ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 14, 2016 17:44:25 GMT -5
I still don't think thunderegg, especially since it just doesn't look like one at all on the outside (remember, you guys are only seeing the poor quality photo, not the actual uncut rock I originally picked up which was not spheroidal and was irregular in shape,) but let me entertain the thought. It does look a little like a thunderegg inside. It looks like the kind of stuff you see inside a thunderegg but, it does lack the visible mineral filled cracks (sutures) that break the surface of the rock. The pictures of the slices show one, or maybe two at the most, entrance fissures for the minerals to enter, not at all like the typical thunderegg with multiple surface fractures allowing intrusion of minerals to the middle of the rock. How many people have ever found a thunderegg in Lake Michigan? In the Leelanaw area? The geology of that area does not include thundereggs. OK, lets say a glacier deposited it because there are no known occurrences of thundereggs in the lower peninsula of Michigan. Where to the north of Leelanaw are there thundereggs? If some one can point out how one lonely thunderegg found it's way to this beach, where this type of rock is not even known to exist, I will concur with the thunderegg theory (and don't tell me it's one of the Lake Superior T-Egg variety because it just plain isn't and does not even remotely resemble one of those.) The closest thing to thunder eggs in Michigan are the septarian nodules found normally in the south, and not normally in the north half of the lower peninsula (although some may exist up there too, maybe left by retreating glaciers.) The septarian nodules in Michigan are quite distinctive and look nothing like a normal thunder egg on the outside. Anyone out there have something to compare to a (possible) thunder egg found in Petoskey territory? I found one other photo of what looks like a typical thunderegg that was found in lake superior. Once again, it looks nothing like the rock I found. Also, note in the post that the rock was never actually positively I.D.ed as a thunderegg. page with thunderegg found in lake superior
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Post by tandl on Jan 3, 2017 11:26:51 GMT -5
Yeah , looks exactly like some i find here . i first thought it was chert with chalcedony mineralization over time, a lot of chert around here, most with fossils. i noticed this particular type doesnt have much fossil evidence . so im leaning toward rhyolite. so thunderegg is pretty much the same, but for shape. the brown areas without much chalcedony flake like it would knap too. And those pics of the crazy lace, are they from the lakes region?
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Post by Lapidaryrough / Jack Cole on Jan 3, 2017 17:57:03 GMT -5
the slabs look like yongnite. Ziggy
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