Enstatite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Inosilicate

Sample ID

NMNH128288

Collection Locality

Frank Smith Mine, Barkly West (near), S. Africa

Spectral Purity

1c2c3c4c # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

EPMA # XRF, EPMA, ICP(Trace), WChem COMPOSITION KEYWORD Oxide ASCII Amount Weight Percent, % Oxide html COMPOSITION: SiO2 56.70 wt% SiO2 COMPOSITION: TiO2 0.01 wt% TiO2 COMPOSITION: Al2O3 1.69 wt% Al2O3 COMPOSITION: FeO 4.97 wt% FeO COMPOSITION: MnO 0.15 wt% Mn0 COMPOSITION: MgO 35.25 wt% MgO COMPOSITION: CaO 0.85 wt% CaO COMPOSITION: Na2O 0.02 wt% Na2O COMPOSITION: K2O 0.02 wt% K2O COMPOSITION: Total 99.66 wt% COMPOSITION: O=Cl,F,S wt% COMPOSITION: New Total wt%

Sample Description

Forms series with Orthoferrosilite and Hypersthene. Dimorphous with Clinoenstatite. Under the microscope this hand-picked sample appears to be moderately altered. Higher index of refraction than expected indicates probable higher iron content than pure enstatite. Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263. IMAGE_OF_SAMPLE:

XRD Analysis

Results of XRD: Enstatite plus a small amount of kaolinite and mica. Salisbury, J. W., Walter, L. W., and Vergo, N., 1987, Mid-Infrared (2.1-25µm) Spectra of Minerals: First Edition, U.S. Geological Survey Open File Report 87-263.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801