This is a preview. Log in through your library . Abstract The formation of quartzo-feldspathic rocks-principally pegmatites-is discussed from the viewpoint of thermodynamic stability of minerals and ...

This is a preview. Log in through your library . Abstract Twelve of the more recent proposals for the classification of igneous rocks are discussed with the intention of noting points of agreement and ...

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Introduction Have you ever visited a canyon or cave and wondered how those formations came to be? Or observed smooth stones by a river or beach? These results are due to a process called weathering.