Gypsum

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Sulfate

Sample ID

HS333.1B, HS333.2B, HS333.3B, HS333.4B

Collection Locality

Washington County, Utah

Spectral Purity

1a2_3_4_ # Gypsum HS333.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1a2_3_4_ # Gypsum HS333.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1a2a3a4a # Gypsum HS333.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1a2_3_4_ # Gypsum HS333.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem

Sample Description

"This sample is colorless in hand specimen (colorless gypsum is called "selenite"), and is white when ground to fine particle size. It also appears to be quite pure, as its spectrum shows. As in the case of the previous sample, the near-infrared spectrum displays very prominent water bands beginning at 1µm and continuing out to 2.5µm." Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1971, Visible and near-infrared spectra of minerals and rocks: IV. Sulphides and sulphates. Modern Geology, v. 3, p. 1-14. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

Pure gypsum Clark, R.N., King, T.V.V., Klejwa, M., Swayze, G.A., and Vergo, N., 1990, High spectral resolution reflectance spectroscopy of minerals: Journal of Geophysical Research, v. 95, no. 8B, p 12,653-12,680.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801