A rapid microspectrochemical method is presented for the estimation of 68 elements from a single arcing of 1 mg. or less of sample. The results are obtained through visual estimates of line intensities based on synthetic powder standards and reported in percentage brackets of 10 to 3, 3 to 1, 1 to 0.3, etc. No attempt is made to attain any high degree of detectability because a knowledge of the trace element content is not necessary for mineral identi fication. A spectrographic emulsion with high speed in the red part of the spectrum and low speed in the ultraviolet part was adapted to these procedures by installing an extra slide in the plateholder. This slide permitted exposure of the high wavelengths while the alkalies were in the arc vapor and at the same time the ultraviolet part was exposed during the total arcing period. -- AATA