nemesis21
noticing nice landscape pebbles
Member since August 2017
Posts: 88
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Post by nemesis21 on Nov 5, 2017 14:02:54 GMT -5
I'd guess that it is a banded iron formation as well. It doesn't quite have the sheen of stuff that I've seen(could be the pictures), but it could polish up well. I have found some stuff like that that looks interesting but ends up being really brittle though so be careful.
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Post by MsAli on Nov 5, 2017 14:21:29 GMT -5
Not familar with Sycamore. Where is it located? I have banded iron that is tan color and some that is red and black. Not all of it is magnetic. On the red banded iron the red is usually a jasper colored by iron and Hematite is actually an iron oxide which can be magnetic or not. Mary Ellen jaspers which some have a lot of hematite are variably magnetic. Some have crystal vugs in them and white quartz veins. Sycamore is one of the mines in Crosby, Mn. I snorkel them and look around the little islands that are there.
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Post by toiv0 on Nov 5, 2017 15:15:37 GMT -5
Not familar with Sycamore. Where is it located? I have banded iron that is tan color and some that is red and black. Not all of it is magnetic. On the red banded iron the red is usually a jasper colored by iron and Hematite is actually an iron oxide which can be magnetic or not. Mary Ellen jaspers which some have a lot of hematite are variably magnetic. Some have crystal vugs in them and white quartz veins. Sycamore is one of the mines in Crosby, Mn. I snorkel them and look around the little islands that are there. Cool area, could also find some Bingamite and silkstone in that area.
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NDK
Cave Dweller
Member since January 2009
Posts: 9,440
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Post by NDK on Nov 5, 2017 15:36:56 GMT -5
Since Billy mentioned it, I was wondering if these could be binghamite, has a chatoyant look in the pix.
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Post by MsAli on Nov 5, 2017 15:41:10 GMT -5
Since Billy mentioned it, I was wondering if these could be binghamite, has a chatoyant look in the pix. I have Binghamite out of another mine. It has more red in it and to me is heavier than this is but ya never know.
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Post by rmf on Dec 11, 2017 8:11:46 GMT -5
The original pics are Rhyolite with some quartz and Iron. There may be some jasper in the first pic but the later appear to be only Rhyolite.
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Post by MsAli on Dec 11, 2017 15:42:48 GMT -5
The original pics are Rhyolite with some quartz and Iron. There may be some jasper in the first pic but the later appear to be only Rhyolite. Interesting. Up further North there is a lot of it, that is similar to this. Where I got it from (middle of a mine pit) there isn't. It is also the only piece, I've ever found of it. I will have to upload a picture of where it came out of.
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Post by MsAli on Dec 11, 2017 15:47:35 GMT -5
According to the USGS website Geologic units containing Rhyolite in Mn Cook - Saint Louis, Carlton - Chisago - Pine Not close to the county this came out of
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Dec 11, 2017 16:12:10 GMT -5
According to the USGS website Geologic units containing Rhyolite in Mn Cook - Saint Louis, Carlton - Chisago - Pine Not close to the county this came out of Rhyolite is a super common volcanic stone. You said the area is volcanic. Just because it isn't "recorded" there doesn't mean you haven't found a new occurrence.
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Post by MsAli on Dec 11, 2017 17:05:24 GMT -5
According to the USGS website Geologic units containing Rhyolite in Mn Cook - Saint Louis, Carlton - Chisago - Pine Not close to the county this came out of Rhyolite is a super common volcanic stone. You said the area is volcanic. Just because it isn't "recorded" there doesn't mean you haven't found a new occurrence. I'm sure the whole state is. But according to what I can find the areas that contain Rhyolite in Mn is in the counties North of us. North shore of lake superior is a good example, and this doesn't look like it. However, I could be very wrong. Just unusual this is the only piece I've ever found there. The picture is taken from shore. This pit runs 450 feet deep. I snorkel half way across and it comes up to 3ft deep. I can sit there for hours. Lots of rocks to dig thru.
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ubermenehune
spending too much on rocks
Member since March 2016
Posts: 293
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Post by ubermenehune on Dec 11, 2017 17:16:12 GMT -5
Based strictly on appearance, rhyolite would've been my guess too. It's typically grainier, more "chalky" than waxier, cryptocrystalline jaspers, cherts or agates. Although river-worn and beach rhyolite cobble can look and feel a lot like jasper.
Perhaps it's a deposit from glacial drift.
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Post by MsAli on Dec 11, 2017 17:34:24 GMT -5
I would describe parts of it as grainy. Especially the "tan" areas. The black and red are more solid-if that makes sense?
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Post by MsAli on Jan 4, 2018 17:59:42 GMT -5
I was researching Mindat and I think Ive figured it out---could it be Argilite--what do you all think?
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Post by toiv0 on Jan 4, 2018 20:17:47 GMT -5
I just read an article or parts of it that are way above my pay grade. Argillite seems to be black to grey in color. Some of the formations in that area have a cream or white colored chert. I will put an address and maybe some one way smarter than me can decipher it. I still say run a knife over it to see what is softer. Looks like the Argillite is a form of sedimentary mud shale which can run a mohs 3 to 7. Pipe stone or catlinite is considered a shale and you can carve it with a knife. conservancy.umn.edu/bitstream/handle/11299/60721/mgs-248.pdf;sequence=1
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Post by MsAli on Jan 4, 2018 20:59:30 GMT -5
I just read an article or parts of it that are way above my pay grade. Argillite seems to be black to grey in color. Some of the formations in that area have a cream or white colored chert. I will put an address and maybe some one way smarter than me can decipher it. I still say run a knife over it to see what is softer. Looks like the Argillite is a form of sedimentary mud shale which can run a mohs 3 to 7. Pipe stone or catlinite is considered a shale and you can carve it with a knife. conservancy.umn.edu/bitstream/handle/11299/60721/mgs-248.pdf;sequence=1Article way over my pay gade as well, but whats interesting is this is north of where I collected it and and just a little further south is Little Falls where there is a ton of Pipestone. If you look at www.mindat.org/geotime.php?t=159 it does show they have collected argillite in this area as well. But not out of the mine I got this from. All very confusing. I took a butter knife to it...pictures to follow....
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Post by MsAli on Jan 4, 2018 21:02:10 GMT -5
You can see where it scratched parts of it, but not all of it. I wish you all could smell it, to me it is very "mineral" (If that makes sense) smelling. As soon as I get near it I can smell it.
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Post by phil on Jan 5, 2018 13:16:55 GMT -5
I just read an article or parts of it that are way above my pay grade. Argillite seems to be black to grey in color. Some of the formations in that area have a cream or white colored chert. I will put an address and maybe some one way smarter than me can decipher it. I still say run a knife over it to see what is softer. Looks like the Argillite is a form of sedimentary mud shale which can run a mohs 3 to 7. Pipe stone or catlinite is considered a shale and you can carve it with a knife. conservancy.umn.edu/bitstream/handle/11299/60721/mgs-248.pdf;sequence=1Article way over my pay gade as well, but whats interesting is this is north of where I collected it and and just a little further south is Little Falls where there is a ton of Pipestone. If you look at www.mindat.org/geotime.php?t=159 it does show they have collected argillite in this area as well. But not out of the mine I got this from. All very confusing. I took a butter knife to it...pictures to follow.... Little Falls? as in Montana? what does the pipestone look like? Thanks
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Post by MsAli on Jan 5, 2018 13:27:40 GMT -5
Article way over my pay gade as well, but whats interesting is this is north of where I collected it and and just a little further south is Little Falls where there is a ton of Pipestone. If you look at www.mindat.org/geotime.php?t=159 it does show they have collected argillite in this area as well. But not out of the mine I got this from. All very confusing. I took a butter knife to it...pictures to follow.... Little Falls? as in Montana? what does the pipestone look like? Thanks Little Falls Minnesota.
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Post by MsAli on Jan 5, 2018 13:29:44 GMT -5
There is a Pipestone Mn as well
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Post by phil on Jan 5, 2018 15:12:30 GMT -5
thanks
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