Diaspore

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Hydroxide

Sample ID

HS416.1B, HS416.2B, HS416.3B, HS416.4B, HS416.6

Collection Locality

Rosebud, MO

Spectral Purity

1b2_3_4_ # Diaspore HS416.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Diaspore HS416.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3b4u # Diaspore HS416.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Diaspore HS416.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Diaspore HS416.6 # 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

"Dimorphic with Boehmite. This sample is impure and is a mixture of bauxite minerals including gibbsite, kaolinite and a very small amount of a ferruginous material. At wavelengths longer than 1.3µm the reflectance of the sample decreases. The sample has a 1.4 µm absorption (overtone of the hydroxyl) and a 1.8 µm absorption which is believed to be a displaced 1.9µm resulting from the presence of a free H2O molecule." Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1971, Visible and near-infrared spectra of minerals and rocks: III. Oxides and hydroxides. Modern Geology, v. 2, p. 195-205. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

Pure diaspore. Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801