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Evaluation of Existing X-Ray Powder Diffraction Standards for Phosphate Minerals

  • Frank N. Blanchard (a1)


Of the roughly 3,000 known mineral species over 290 or 10 percent are phosphates. This report deals with a recently initiated project, the purpose of which is to produce better X-ray powder diffraction standards than currently exist for selected phosphate minerals. The project involves evaluation of existing X-ray diffraction standards for phosphate minerals, and collection of new data from species for which current data are judged unsatisfactory.



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Appleman, D. E., and Evans, H. T.Jr., 1973, Indexing and least-squares refinement of powder diffraction data. Geol. Survey Computer Contribution, No. 20, 62 p.
Smith, G. S. and Snyder, R. L., 1979, F(n):a criterion for rating powder diffraction patterns and evaluating the reliability of powder pattern indexing. J. Appl. Cryst. 12, 6065.


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