Reactive fluids can contribute to the production of spectacular patterns upon encountering a variety of geological materials. At the Earth’s surface, this can occur by dissolution or precipitation reactions as described above. In more confined environments with less fluids present, precipitation of one mineral often requires local dissolution of another and vice versa. Such coupled dissolution-precipitation processes often lead to the replacement of one mineral or rock, by another. Over the last decade, and notably through of the work of Andrew and Christine Putnis and collaborators at the University of Münster, it has become increasingly clear that the evolution of...

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