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Post by Pat on Jun 11, 2018 11:42:13 GMT -5
I don’t know. Could it be slag from an up river factory?
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jun 11, 2018 12:19:45 GMT -5
I thought of slag too. It is amazing the places it pops up, even far away from populated areas. First, if you have a strong magnet, see whether it is attracted to any areas. It looks as if it might contain crystals of a couple of other minerals, too. I have seen schists and metallic ores that contained things like garnets, so you might want to see if you can identify the shape/habit of any crystal inclusions to further identify. You also might want to cut a window in one edge to see below the weathered surface.
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Ami
starting to spend too much on rocks
Member since September 2016
Posts: 162
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Post by Ami on Jun 11, 2018 15:49:31 GMT -5
I thought of slag too. It is amazing the places it pops up, even far away from populated areas. First, if you have a strong magnet, see whether it is attracted to any areas. It looks as if it might contain crystals of a couple of other minerals, too. I have seen schists and metallic ores that contained things like garnets, so you might want to see if you can identify the shape/habit of any crystal inclusions to further identify. You also might want to cut a window in one edge to see below the weathered surface. Is not magnetic, look like defoliated metamorphic rock, have some mica and black crystals, very silver shin and as I said heavy. I will try to cut a corner when I get home in WA Here is one similar just gold shine, also very heavy.
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Post by rmf on Jun 19, 2018 16:18:00 GMT -5
The second image looks like garnet schist. You can confirm this by: Host rock under magnification has lots of flakes of mica that come off in your hand or with a knife. the little spots are reddish and are small 12 sided crystals. (dodecahedroms) the first image looks like thet same but possibly with the addition of Staurolite crystals. The image needs more magnification for me to tell for sure.
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Post by vegasjames on Jun 19, 2018 17:59:42 GMT -5
Could be phyllite, which is much finer in crystal structure than schist. Schist has a more visible crystal structure to the naked eye.
Slate converts in to phyllite, which can then further metamorphose in to schist. Phyllite has a metallic luster.
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