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I came across really weird mineral in marble. It's somewhat metamorphosed: some amphiboles, chlorite, epidote biotite, plagioclase and potassium feldspar has formed. Its composition is (wt%): SiO2...
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I've used several thermometers and the results seem to contradict one another quite allot. Maybe someone can suggest a method, that's most reliable?
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I've found these in paleoproterozoic marbles. Could it be oncolite? Since I'm not a paleontologist, I would really like to hear your opinions on what this might be.
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