In the course of the development of a precise technique for the use of the petrographic microscope in rock analysis, attempts have been made to determine the mineral constituents quantitatively. Such determinations have had their greatest success when applied to thin sections of rock samples. However, there are numerous occasions when analyses have to be made of powdered material or loose crystals, and the investigator cannot have recourse to such sections. An attempt has been made, therefore, to develop a method which would be generally applicable to this type of material.

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