The original sample and mid-IR spectrum was described in: Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263. From that study, the sample was described as pure. IMAGE_OF_SAMPLE:
XRD Analysis
Pure Anorthite.
X Units
cm⁻¹
Y Units
Absorbance
Data Points
1,801
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Attribution
USGS Spectral Library Version 7, U.S. Geological Survey