Corundum

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Oxide

Sample ID

HS283.1B, HS283.2B, HS283.3B, HS283.4B

Collection Locality

Transvaal

Spectral Purity

1c2_3_4_ # Corundum HS283.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Corundum HS283.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Corundum HS283.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Corundum HS283.4B # 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 was prepared from crystals that were brownish near the surface and blueish-green near in the interior. Hunt, G.R., J.W. Salisbury, C.J. Lenhoff, 1971, Visible and Near-Infrared spectra of Minerals and Rocks: III. Oxides and Hydroxides. Mod. Geol. 2, pp 195-205. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV additional phase File: corun283.out, -.mdi References: Huebner's reference patterns; JCPDS #5-355 Found: corundum, minor diaspore Comment: Very sharp corundum reflections suggest excellent crystallinity and compositional homogeneity.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126