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Can anyone help to identify what this banding is inside this rock? Would be very interested to find out!
This stone is exhibiting what we call Liesegang rings, named after German Chemist Raphael Liesegang.
If you want to brag, you could say that it is thought by some scientists to be the result of a catalytic precipitation process called the Ostwald-Liesegang supersaturation-nucleation-depletion cycle!
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