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What mineral is this?

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Caalt textn you please let me know what mineral you think this is.

Thank you!


alt text

asked May 4, 2012 by scotvonfeldt (120 points)

1 Answer

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This looks like banded calcite/aragonite (travertine or tufa). Try putting strong acid on it to see if it bubbles - that will make it certain and can distinguish it from agate.

answered May 8, 2012 by hershel (49,750 points)

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