Analysis by Norma Vergo indicates the sample is clay + quartz + calcite + trace feldspar? The less than 2µm cut has illite/smectite 96%, illite + trace amounts of quartz.
X Units
cm⁻¹
Y Units
Absorbance
Data Points
2,126
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Attribution
USGS Spectral Library Version 7, U.S. Geological Survey