Microcline+others

Spectrum Details

Modality

NIR

Category

soil

Material Type

Intimate

Sample ID

HS107.3B

Collection Locality

Keystone, South Dakota

Spectral Purity

1a2a3a4a # HS107.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

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

Sample Description

Natural intimate mixture of microcline with lesser amounts of albite and muscovite. "The spectrum (107B) displays a very intense OH band near 1.4µ with an accompanying feature near 2.2µ. The very weak band near 1.9µ indicates only a very small amount of H2O. The bands are consistent with the incipient alteration of this sample to kaolinite." Sieve interval 74 - 250µm. Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106. Note, however, that the 2.2-2.4 µm bands are those of muscovite (or similar mica), not kaolinite as noted by Hunt and others. That is confirmed by XRD below. R. Clark IMAGE_OF_SAMPLE:

XRD Analysis

Microcline + albite(minor) + muscovite(minor)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126