Chlorite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Phyllosilicate

Sample ID

HS179.1B, HS179.2B, HS179.3B, HS179.4B, HS179.6

Collection Locality

Colorado

Spectral Purity

1b2_3_4_ # Chlorite HS179.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Chlorite HS179.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2b3b4u # Chlorite HS179.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Chlorite HS179.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1b2_3_4_ # Chlorite HS179.6 # 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

A spectrum for this sample was published in: Hunt, G.R., J.W. Salisbury, 1970, Visible and near-infrared spectra of minerals and rocks: I. Silicate minerals. Modern Geology, v. 1, p. 283-300. With the note: "This specimen appears to be quite pure. The spectrum displays three broad bands between 0.7 and 1.1µm. The bands at 0.7µm (barely discernible in this spectrum but very marked in the following sample (HS197) and at 0.9µm are due to Fe3+ in six fold coordination. The band near 1.1µm is due to the ferrous ion in six fold coordination. The sharp features at 1.4µm and between 2.0 and 2.6 µm are hydroxyl bands as in previous samples." For additional information on spectral features of chlorites see: King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of Chlorites and Mg-Serpentines Using high-Resolution Reflectance Spectroscopy. Jour. Geophys. Res., 13,997-14,008. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 7.0-9.5 keV File: chlor179.mdi, *.out References: Bailey (198-, MSA vol.13, p.557); Huebner's reference patterns Found: Tri-octahedral mica, trace 7 or 14 Angstrom phase, and an un indexed weak reflection at 3.71 Angstroms Comment: The mica could be indexed as a 1M phlogopite; the pattern is very similar to biotite MBLM. Reflections at 7.2 and 3.54 Angstroms are consistent with a chlorite or a kaolinite mineral. No 14 Angstroms reflection was observed.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126