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Post by Jugglerguy on Oct 31, 2013 17:58:25 GMT -5
This is mostly chert that I found on beach in the tiny little town of Norwood on Lake Michigan. My son and I went there this spring looking for Petoskey stones. We didn't find many Petoskeys there, but we found a pudding stone, a piece of cladapora coral that I posted here a while ago, and a bunch of banded chert. I just did a search to be sure I had the right town, and it seems that this chert is actually referred to as "Norwood chert". Some of it is also from around my area on the Lake Huron side of the state.   The long, skinny piece started out as a much bigger rock with lots of fractures. I broke it up and this was one of the shards.  The plain piece was not from Norwood, but polished up really nice.  This rock was from near Traverse City. We drove some backroads looking for Petoskey stones in the gravel. We didn't find any Petoskeys, but we found an area that had been recently cut over and there was turned up dirt from the logging trucks. We all got out and walked around for a few minutes and I found this rock. I have no idea what it is, but it has that waxy look that chert has. It looks better in person.   I think these two are from either Lake Michigan, Huron or Superior. My guess is Superior, but I really don't know. They look like agate or jasper from some other place, but I don't know how they could have gotten mixed up with my chert collection. Whatever they are, they look cool.  |
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grizman
freely admits to licking rocks
Member since July 2011
Posts: 878
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Post by grizman on Oct 31, 2013 18:58:14 GMT -5
Those are all very nice specimens. Of course your very professional polish job is what really makes them fit into the "WOWWWZERS" category! Some very nice finds, that's for sure.
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Post by Drummond Island Rocks on Oct 31, 2013 19:22:09 GMT -5
The chert looks great Rob. Not sure what those are in the last photo but I sure would like a whole barrel full, what a great shine!
Chuck
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Post by Jugglerguy on Oct 31, 2013 19:44:16 GMT -5
Chuck, I this batch looked sort of similar to your Flint Ridge rocks.
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jamesp
Cave Dweller 
Member since October 2012
Posts: 36,606
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Post by jamesp on Oct 31, 2013 19:51:53 GMT -5
Great chert. Well rounded for sure and a smokin polish. The layers are from what? Like sediment....that silicified.?
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Post by Jugglerguy on Oct 31, 2013 20:12:33 GMT -5
I think chert is a sedimentary rock. As for whether it is silicified, that's beyond my knowledge. Sabre52 recently explained the difference between agate, jasper, chert, etc. in this thread. |
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Post by Drummond Island Rocks on Oct 31, 2013 20:16:07 GMT -5
I came across this site while looking for info about our flint and it has some good info about chert and flint. Mel's explanation's are usually spot on though. Flint Verses Chert: What's the difference? www.theaaca.com/Learning_Center/flintvs.htmChuck |
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snuffy
Cave Dweller
Member since May 2009
Posts: 4,319
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Post by snuffy on Oct 31, 2013 20:35:16 GMT -5
That is some very nice different material,took a great shine.
snuffy
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panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on Oct 31, 2013 22:48:13 GMT -5
those are really beautiful Rob. You got a great shine on them. Especially like the red round one.
It is such a coincidence in that I was moving rocks and going thru some that I got when I visited you and I found a rock that looked a bit like petwood, a bit like coral, and a bit like chert. I wondered what exactly it was, but now I know as it matches some of yours here exactly.
Good job and thanks for sharing.
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Post by Jugglerguy on Nov 1, 2013 5:46:19 GMT -5
Hey Mark, I must have given you a piece that I got from Lake Michigan. I doubt that you picked up a piece while you were here, but I do find banded stuff here occasionally.
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cardiobill
freely admits to licking rocks
Member since March 2012
Posts: 881
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Post by cardiobill on Nov 1, 2013 9:21:30 GMT -5
Really nice Rob
They rounded up really nice
I really like the banded ones
Bill
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Post by pghram on Nov 1, 2013 12:12:02 GMT -5
That chert is really nice, great patterns & colors. Great shapes & shine too.
Rich
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kaldorlon
spending too much on rocks
Member since October 2013
Posts: 413 
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Post by kaldorlon on Nov 1, 2013 12:25:41 GMT -5
Excellent job!
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Post by 150FromFundy on Nov 1, 2013 17:58:07 GMT -5
Really nice shape and shine. We're these pre-rounded beach pebbles, or dig you have them in the 60/90 for several weeks, or months?
Darryl.
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Post by Jugglerguy on Nov 1, 2013 22:51:09 GMT -5
These were all beach rounded. I had some tumbling for at least a couple months, but that was mainly for a couple that just wouldn't get done. I still have a few in 60/90 that have soft spots that won't finish. Here's the only picture of my rough:  Here's the beach we got them from:  |
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Post by Toad on Nov 1, 2013 23:49:14 GMT -5
Great looking stones - beautiful polish.
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Tom
fully equipped rock polisher
My dad Tom suddenly passed away yesterday, Just wanted his "rock" family to know.
Member since January 2013
Posts: 1,557
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Post by Tom on Nov 2, 2013 17:05:22 GMT -5
Those are really nice rocks, you did a fantastic job!
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bsky4463
fully equipped rock polisher
Member since September 2013
Posts: 1,696
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Post by bsky4463 on Nov 3, 2013 7:51:27 GMT -5
Band chert provides great visuals and with your polish skills very gemmy. Nice finds nice job. Cheers.
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mibeachrocks
starting to spend too much on rocks
Member since September 2013
Posts: 198
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Post by mibeachrocks on Nov 12, 2013 14:26:13 GMT -5
Really nice. Great job. I know where I'm stopping next summer.
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SirRoxalot
freely admits to licking rocks
Member since October 2003
Posts: 790
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Post by SirRoxalot on Dec 30, 2013 2:35:59 GMT -5
The first unknown is BIF, or banded iron formation, aka "jaspilite". Red jasper/chert interlayered with black magnetite/hematite. Literally hills of the stuff in MI. A low grade iron ore, can make pretty nice cabs when the mix of red and black is right.
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