Abstract
A method is described for making modal analyses of fine-grained mineral aggregates, by cutting up and weighing electron microprobe scanning pictures for one or more elements. Groundmass iron-titanium oxides in volcanic lavas are used to check the accuracy of this technique, relative to conventional point counting. Electron microprobe scanning picture modes and reflected light point counting modes for these minerals are almost identical, whereas transmitted light modes give serious overestimates of their abundances.
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