Infrared and Raman spectroscopic studies of structural variations in minerals from Apollo 11, 12, 14, and 15 Samples.
Infrared and raman vibrational spectroscopic data, yielding direct information on molecular structure, have been obtained for single grains (>150 um) of minerals, basalts, and glasses isolated from Apollo 11, 12, 14, and 15 rock and dust samples, and for grains in Apollo 14 polished butt samples. From the vibrational data, specific cation substitutions were determined for the predominant silicate minerals of plagioclase (an71 to an95), pyroxene (fs6 to fs53), and olivine (fa14 to fa45). Unique spectral variations for grains of k-feldspar, orthopyroxene, pyroxenoid, and ilmenite were observed to exceed the ranges of terrestrial samples, and these variations may be correlatable with formation histories. Alpha- quartz was isolated as pure single grains, in granitic grains composited with sanidine, and in unique grains that were intimately mixed with varying amounts of glass. Accessory minerals of chromite and ulvospinel were isolated as pure grains and structurally characterized from their distinctive infrared spectra. Fundamental vibrations of the sio4 tetrahedra in silicate minerals were used to classify bulk compositions in dust sieved fractions, basalt grains, and glass particles and to compare model characteristics for Maria, Highland, and Rille samples. No hydrated minerals were found in any of the samples studied, indicating anhydrous formation conditions.
Proc. 3D Lunar Sci. Conf., Houston., Texas, 1/10-13/72, the Mit Press, V. 3, PP. 3047-3067