Montmorillonite SCa-2.a

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Phyllosilicate

Sample ID

SCa-2.a, SCa-2.b

Collection Locality

San Diego County, CA

Spectral Purity

1b2_3_4_ # SCa-2.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3b4_ # SCa-2.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

XRF # XRF, EPMA, ICP(Trace), WChem

Sample Description

A spectrum for this sample was published by: Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res. 12653-12680. Who noted that it was spectrally pure. The spectrum from 2.5-25µm was published 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. Grain size fractions are indicated by the extension after the sample number: .a = coarse grain fraction .b = fine grain fraction (less than 2 microns) IMAGE_OF_SAMPLE:

XRD Analysis

Analysis by Norma Vergo indicates the sample is smectite + trace amounts of quartz, the less than 2µm cut is pure smectite.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126