Five igneous rock specimens from the Peninsular Ranges Batholith of southern California have been analyzed for mineral content in a comparative study. Excellent agreement between the two methods is observed for quantities of the major components for all rocks except an olivine gabbronorite. Discrepancies in the gabbronorite analyses are primarily due to sample inhomogeneities as well as the use of calculated reference intensity constants for the several solid solution minerals occurring in this sample. Where both experimental reference intensity constants and sample measurements are obtained using the aerosol suspension technique for sample preparation, relatively high accuracy and relatively rapid data collection may be achieved with the X-ray method.--Modified journal abstract.

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