This sample contains well-crystallized kaolinite that when mixed with trace amounts of smectite and illite spectrally mimics poorly crystalline kaolinite. The sample was collected from an altered Tertiary tuff involved in a hydrothermal event about 7.6 Ma.
XRD Analysis
Clay separate contains wxl kaolinite, smectite (trace), and illite (trace).
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