These are the spectra from of suite of particulate feldspar samples with a grain size range of 710 to 1000 microns. The samples were carefully prepared to ensure that no foreign materials are present. Their composition has been established using electron microprobe and/or bulk chemical analysis. No x-ray diffraction analysis has been performed, so the true identity of some of these samples is still in question. This is especially true of the K-spars. The vertical lines are intended to call attention to changes in various features in the spectra with change in feldspar composition.

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