Five meteoritic and three terrestrial ortho-enstatites have been examined using powder and single-crystal x-ray techniques. Geiger-counter intensity data are presented for two samples, one ordered and one disordered. Disordered ortho-enstatites were found in four of the meteoritic and none of the terrestrial samples. In the work to date (Brown and Smith, 1963, and the present paper) disordered ortho-enstatite has been detected in four enstatite achondrites, and found absent from three hypersthene and one pyroxene-plagioclase achondrite.

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