Cholesterol as a Standard in the X‐Ray Diffraction of Clay Minerals

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Abstract
Cholesterol was found to be a satisfactory standard with which to align X‐ray diffractometers for work with the relatively long spacings which are the chief diagnostic characteristic of clay minerals. Sensitivity of peak intensity and position to various diffractometer adjustments was determined, and improved results with clay minerals were demonstrated. Alignment of the diffractometer at some relatively short spacing introduces the risk of obtaining a long‐spacing peak of diminished intensity or no peak at all. However, good alignment at a relatively long spacing ensures good alignment at shorter spacings as well.

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