The absorption of infrared radiation over the range 2.0 to 15.0 microns by pulverized (suspended in Nujol) quartz frcm various localities and origins was measured in a Beckman Infrared Spectrometer. The characteristic absorption of quartz is compared to those of chalcedony, opal, alpha cristobalite, and fused silica. The effects of crystal structure apparently predcminate over these of the silica molecule in the infrared absorption by pulverized silica minerals. Absorption by a single oriented plate of quartz or muscovite is dissimilar in fine detail to that of random powder.

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