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Natural SciencesEarth SciencesGeologyGeochemistryMineralogySpectroscopyInfrared SpectroscopyNear-infrared SpectroscopyOptical MineralogySilicate MineralsFar-infrared SpectroscopyFeldspar ClassificationFeldspar MineralsFeldspar PetrologyInfrared Absorption SpectraInfrared SpectraIsomorphous Replacement