Diopside NMNHR18685 ~160 Pyx

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Inosilicate

Sample ID

NMNHR18685

Collection Locality

DeKalb, New York

Spectral Purity

1b2c3b4b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

XRF # XRF, EPMA, ICP(Trace), WChem COMPOSITION KEYWORD Oxide ASCII Amount Weight Percent, % Oxide html COMPOSITION: SiO2 54.77 wt% SiO2 COMPOSITION: TiO2 0.05 wt% TiO2 COMPOSITION: Al2O3 0.49 wt% Al2O3 COMPOSITION: FeO 0.87 wt% FeO COMPOSITION: MnO 0.06 wt% MnO COMPOSITION: MgO 18.26 wt% MgO COMPOSITION: CaO 25.60 wt% CaO COMPOSITION: Na2O 0.39 wt% Na2O COMPOSITION: K2O 0.01 wt% K2O COMPOSITION: Total 100.49 wt% COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S COMPOSITION: New Total wt%

Sample Description

Forms series with Hedenbergite and with Johannsenite. "Results of petrographic examination: Most of the sample, which is green and about 13mm x 10mm x 6mm is clean, fresh. There is one area which is eroded and weathered and probably impure. Crushed sample was hand-picked to avoid impurities. There is a moderate amount of weathering and alteration. Alteration is brown in color (limonite?)." 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

Diopside plus a trace of quartz. Spectra show no quartz bands, but do show a trace of carbonate in reflectance of 74-250µ and 0-74µ size ranges. 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. Diopside + trace quartz (Norma Vergo).

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126