High Quality Content by WIKIPEDIA articles! Ruin marble is a kind of limestone or marble that contains light and dark patterns, giving it the impression of a ruined cityscape. The patterns (similar to Liesegang rings) develop during diagenesis due to periodic rhythmic precipitation of iron hydroxides from oxidizing aqueous fluids restricted laterally by calcite filled joints. Liesegang rings are a phenomenon seen in many, if not most, chemical systems undergoing a precipitation reaction, under certain conditions of concentration and in the absence of convection. The phenomenon was first noted over one hundred years ago (in 1896) by the German chemist Raphael E. Liesegang, and has aroused the curiosity of chemists for many years. It was first noted when he dropped a solution of silver nitrate on to a thin layer of gel containing potassium dichromate. After a few hours, sharp concentric rings of insoluble silver dichromate formed. When formed in a test tube by diffusing one component from the top, layers or bands of precipitate form, rather than rings.

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