A new technique is described for mounting heavy mineral grains on a standard petrographic slide that permits opaque grains to be polished and studied by reflected light whereas the transparent grains on the same slide can be studied in transmitted polarized light.The importance of accurate determination of the iron oxides, particularly, is shown by a brief review of recent investigations in paleomagnetic studies, seach for magnetite-free, ilmenite-rich black sands, and origin of redbeds.The technique described not only makes possible the identification of the opaque grains, but also permits use of any distinctive textural relationships in these grains in the problem of locating source areas.

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