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David Tuttle posted an image in the group University of Michigan Museum of Paleontology from the myFOSSIL app 2 years, 8 months ago
2 years, 8 months ago2 years, 8 months agoAny ideas? I cleaned this in acid and Dawn dish soap. After it sat in the sun for about an hour that black dot appeared. It is an oily substance.
What kind of acid did you use and for how long?
It might be a rock with mineral veins
I used Oxalic acid and about 15 min
If you saw all the different angles it’s very symmetrical