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Manganese Slag with widmanstatten pattern?

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Thank you for taking your time to reply. I agree with the Ni & the Fe ratios; however, the Ir level is 1,100 ppm, way too high for terrestrial or ET for that matter. The extraordinary high Mn & Ir ratios indicate that it is man made but the pattern suggests a cooling period so extensive that it disqualifies that as a possibility.

I imagine that there is a very simple explanation but as I am just beginning to learn about rocks/minerals it eludes me. Although I have a long way to go it sure has been a lot of fun destroying ignorance. Thank you again for taking your time to help me with this little puzzle.

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