Labradorite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Tectosilicate

Sample ID

HS17.1B, HS17.2B, HS17.3B, HS17.4B

Collection Locality

Ontario

Spectral Purity

1c2_3_4_ # HS17.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS17.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2c3b4b # HS17.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS17.4B # 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

"T-10 Labradorite 17B--Ontario. This plagioclase feldspar is composed of 30 to 50% albite. The spectrum of this sample is relatively flat and has a low reflectivity caused by the presence of magnetite as a microscopic disseminated impurity. We cannot account specifically for the maximum in reflectivity near 1.0µ in this spectrum. It is due to exceptionally broad, very weak absorptions on either side." 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. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

Labradorite + 6.25, 6.34 Angstroms (small amount) (Norma Vergo, USGS)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126