Diopside

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Inosilicate

Sample ID

HS15.1B, HS15.2B, HS15.3B, HS15.4B, HS15.8

Collection Locality

Edwards, NY

Spectral Purity

1c2_3_4_ # Diopside HS15.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Diopside HS15.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2d3b4b # Diopside HS15.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Diopside HS15.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # Diopside HS15.8 # 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 Hedenbergite and with Johannsenite. "This is not a pure magnesian diopside. An absorption bands at 1.05 indicates the presence of ferrous iron in the crystal structure. A small amount of water in fluid inclusions is indicated by the weak H2O absorptions." 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. Grain size fractions are indicated by the extension after the sample number: .1B = IMAGE_OF_SAMPLE:

XRD Analysis

40 kV - 30 mA, 6.5-9.5 keV File: diop15.out, -.mdi References: Borg and Smith (1969); Huebner's reference patterns Found: Clinopyroxene, trace mica (three basal reflections) Comment: Superbly crystallized pyroxene. Excellent position and intensity match with synthetic diopside of composition CaMgSi2O6. The high 2-theta side of the -221 reflection has a shoulder that is absent in the pattern of the synthetic material and the pattern calculated by Borg and Smith; however, a similar shoulder is observed in clinopyroxene HS119.3B and in a pattern of diopside from France. The pyroxene is diopside and the mica is probably phlogopite.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126