Hypersthene NMNHC2368

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Inosilicate

Sample ID

NMNHC2368

Collection Locality

Western Greenland

Spectral Purity

1b2b3b4b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

EM # XRF, EPMA, ICP(Trace), WChem

Sample Description

Enstatite-orthoferrosilite series member. "Results of petrographic examination: One piece and one small fragment weighing 21.59 g. Part of single crystal; black. Very small amount of surface contamination which may be removed by scratching. Also some quartz inclusions which may be possible to break free. Under the microscope it is green-brown pleochroic with a relatively high index of refraction. It appears mildly altered with some (2%) iron-stained opaque material present." 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

This sample contains hypersthene plus a small amount of talc and some other minerals (small amount). No clinopyroxene exsolution seen. (Norma Vergo) "This sample is predominantly hypersthene with a small amount of talc and a small amount of other mineral(s). However, the amount of talc appears insufficient to affect the infrared spectrum, because even the strong hydroxyl bands of talc between 3600 and 4600 cm^-1, which are extremely prominent in the spectrum of the 0-74 µ size range of talc, are not obvious in the spectrum of the 0-74 µm size range of hypersthene." 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

2,126