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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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Classification of igneous rocks revisited

Petrology, I must admit, was never my favourite subject even though I had to do quite a bit of it during my time as a student. Even my Honours project had a petrological component. An important tool for the classification of igneous rocks is the QAPF diagram which forms the basis of the IUGS classification of igneous rocks (Le Bas and Streckeisen, 1991). It was interesting to go back to this

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