Convert Elements to Oxides
Shows how to take elemental weight % values and convert them to oxide weight % values, which can be used for the case when electron microprobe (EPMA) data are reported as elements and oxides are needed, or when converting star compositions to oxides so that they can be compared to rocks. ERROR: note that the correction for K2O misses the factor of 2; so it should be 1.2047 (instead of 2.4093) and 0.8301 (instead of 0.4151)
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