Crandallite in a crandallite-clay quartz sandstone was determined by scanning electron microscope and by electron probe microanalysis. Extrapolation of this information to similar rocks facilitates the distinction in thin section between crandallite and associated minerals in the phosphatic sediments from Florida.

The crandallite used in this study was found to be a strontian variety intermediate between crandallite and goyazite (Cn20Gz30), and probably much of the crandallite in Florida is of a similar composition. Crandallite was formed from the elements in carbonate fluorapatite and clay minerals and during the process Sr has been enriched many times over its concentration in the source mineral (apatite).

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