This paper presents x-ray powder diffraction data for most of the ore minerals. The patterns have been classified in such a way that an unknown mineral may be identified by its pattern, provided it is contained in this collection. Much of the work on the project was carried out at Harvard University during the years 1935-1937. Since then, data have been accumulating, and as there is an almost unlimited amount of work that could be done it has been difficult to choose a suitable point at which to stop for purposes of publication. The collection and classification as they now stand have been found to be most useful in the mineralogical study of ores. They have been in laboratory use for three years during which time they have been checked, revised and enlarged.

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