Abstract
An attempt is made to assess the relative merits of quantitative X-ray diffraction analysis and optical modal analyses of sedimentary rocks. Chemical analyses of S and CO 2 enable a direct check of the accuracy of total carbonate and sulphide determinations, while indirect methods based on correlation coefficients are used to check the analyses for total clay minerals. It is concluded that quantitative X-ray diffraction provides the most reliable mineralogical abundance data.
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