A method is described for the quantitative X-ray powder diffraction determination of minerals in metamorphosed volcanic rocks of the greenschist, epidote-amphibolite, and amphibolite facies. In this method the intensity of the (111) diffraction for a powdered metallic Cu internal standard was compared to the intensities of selected diffractions for minerals of each facies.Graphs relating X-ray diffraction intensities to concentrations were prepared for actinolite, albite, almandine, anthophyllite, biotite, chlorite (omega: 1.59), diopside, epidote, hornblende, muscovite (2M1), plagioclase (An30), and quartz.Results using this method are within graphic of those obtained by Rosiwal analysis.

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