lparker
fully equipped rock polisher
Still doing too much for being retired!
Member since March 2008
Posts: 1,202
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Post by lparker on Jun 30, 2015 15:55:24 GMT -5
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lparker
fully equipped rock polisher
Still doing too much for being retired!
Member since March 2008
Posts: 1,202
|
Post by lparker on Jul 1, 2015 8:14:53 GMT -5
wasn't mine so I couldn't damage it. Would selenite survive the freeze/thaw cycle of Michigan? It looks like calcite, but I've never seen calcite "cleave" like that. A little research "Pencil Selenite (or Pencil Gypsum) is long narrow crystals of gypsum found only in the old gypsum mine in Grand Rapids, Michigan." So maybe it is. I may be able to get my hands on it or one like it this weekend along with other UP specimens. Hmmm, maybe fluorite, but I never saw fluorite that cleaved like that.
Thanks, Lee
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Post by snowmom on Jul 2, 2015 10:54:29 GMT -5
hard to tell but in that first photo the crystals look like they have grooves. Tourmaline can be found in the great lakes region, not usually clear/white though. tandl has commented on calc-silicate found in glacial transports here as well. Maybe he will check in on this.
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lparker
fully equipped rock polisher
Still doing too much for being retired!
Member since March 2008
Posts: 1,202
|
Post by lparker on Jul 6, 2015 8:58:31 GMT -5
Thanks everyone. I probably won't get any of this stuff but I just bought 90 lbs of other various rock from the Keweenaw that I will be facing in the the next two weeks that I will need help with. Some I know as greenstone, some have visible copper in it, some I believe is prehnite. I'll be back...
Lee #1
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jul 11, 2015 22:21:41 GMT -5
Looks like a sagenite spray without the surrounding Jasper.
Sagenite = calcite
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Post by snowmom on Jul 12, 2015 7:04:49 GMT -5
lparker, I just learned about wollastonite,(spar) looks like your stuff in some of the google images I pulled up. guess it is found in Canada. and Lake Superior region according to what I read. Might be it?
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