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Showing results for tags 'banded iron formation'.
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So I went to see a client of mine this morning in a town I haven’t been to before There was a crystal shop which I popped in to They had this piece of banded iron formation (approx 5cm across). But she didn’t know where it was collected from. Anyone have any idea ? @MarcoSr, @Wrangellian ???
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I have a small slice of a piece of banded iron from a larger chunk I found in the minnesota river bottoms near minneapolis. The piece is probably a piece of glacial till form the ranges a few hundred miles north but i have not seen any thing so far that is similar to what i have. There is one large band of hematite and magnetite near the center that clearly shows no folds and a smaller less visible band under the lighter orange object also shows no folding. One side of the slice shows a channel or void while the other shows none. If you were to rotate this you would have a cup shape. This structure looks nothing like any stromatolites i have seen and besides the larger band the material seems mostly non compacted. The center of the channel is fairly clear crypto-crystalline material with some yellowish green staining along the inner boundry and clouding along with some black filamentous material (possibly helical) all roughly oriented in the same direction. I put up some videos on you tube and posted on some more mainstream fossil id and geology fourms but have yet to hear anything at all. Not sure if i can link a you tube here but you can find it by looking up banded iron MN new on youtube where i have it under the microscope. I will post a picture but the ones i have are too large to fit so i will try to resize them if there is any interest. Thanks
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