Cryptomelane, a potassium manganese oxide mineral, is relatively common in New Mexico (Hewett and Fleischer, 1960). Both supergene and hypogene cryptomelane have been recognized. However, the occurrence of cryptomelane as oriented growths in sylvite has not been reported previously. In September 1960, samples of sylvite containing oriented growths of cryptomelane from Carlsbad, New Mexico, were collected by Mr. T. L. Gambill, senior geologist of the United States Borax & Chemical Corp. Mr. Thomas M. Cramer, of the same corporation, provided a sample for this study.

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