Glaucophane

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Inosilicate

Sample ID

HS426.1B, HS426.2B, HS426.3B, HS426.4B, HS426.6

Collection Locality

California

Spectral Purity

1c2_3_4_ # Glaucophane HS426.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Glaucophane HS426.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2c3c4c # Glaucophane HS426.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Glaucophane HS426.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Glaucophane HS426.6 # 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

Forms series with Ferroglaucophane. Original spectrum published in: 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. With the comment:"The iron-free end member is very rare, and in most glaucophane there is some replacement of Mg by Fe^2+ and of Al by Fe^3+. Such substitution results in the broad absorption from 0.6 to 1.0µm. The 1.4µm hydroxyl band is quite evident, and the 2.32µm feature is the best resolved band in the spectrum. The 1.9µm band indicates that a little included water is present." Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

Analysis by Norma Vergo indicates glaucophane + chlorite + others.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126