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> At 14:31 +0000 15/01/16, Treloar, Peter J wrote: >> ...... >> >> BUT and this is a BIG BUT: I know that there are minerals that you >> can not easily identify using optical techniques. But the bottom lone >> before any scientist puts a sample into an EPMA they need to know >> what they are looking at. This is basic science. Why spend grant >> money identifying quartz or calcite (or even differentiating between >> pyroxene and amphibole) when you should be able to do it on the >> optical microscope. There is a need to do optical microscopy not just >> to identify mineral assemblages, but do the whole paragenesis thing. >> >> ...... >> >> Peter Treloar Hello Peter, I simply want to thank you to sing the praise of petrography, the prerequisite for petrology ! Christian Nicollet, an old guy