Among a number of specimens from Bisbee, Arizona, sent to the authors for identification by Mr. English of Ward’s Natural Science Establishment, three contained a crust of a del icate blue-green material that proved to be homogeneous on microscopic examination and had optical properties that did not agree with those of any known mineral. Mr. English and Ward’s Natural Science Establishment generously presented us with the specimen that seemed most suitable for further study, and we acknowledge our indebtedness to them.

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