Nephrite

Spectrum Details

Modality

FTIR

Category

mineral

Material Type

Inosilicate

Sample ID

HS296.1B, HS296.3B, HS296.4B

Collection Locality

British Columbia

Spectral Purity

1c2_3_4_ # HS296.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2c3b4_ # HS296.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns SPECTRAL_PURITY: 1c2_3_4_ # HS296.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

None # XRF, EPMA, ICP(Trace), WChem COMPOSITION_TRACE: None

Sample Description

"I-19 Nephrite 296B--British Columbia: Nephrite is a tough compact variety of either tremolite or actinolite, which is used as the second source of gem quality jade (see inosilicate, I-9 for other source, jadeite). This sample contains magnetite as an impurity, which contributes to its low reflectivity, but the ferric and ferrous features are still apparent at 0.7µ and 1.0µ, as is the accompanying fall off to the blue. The hydroxyl features are quite evident at 1.4µ and 2.33µ with a small feature at 1.9µ indicating including water." Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1973, Visible and near-infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geology, v. 4, p. 85-106. 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: neph296.out, -.mdi References: JCPDS # 13-347; Huebner's reference patterns Found: chlorite, Ca-amphibole, unindexed weak reflection at 1.804 Angstroms. Comment: Some strong chlorite basal intensities present, but the (001) and (003) are weak. Fairly well crystallized tremolite is observed with a very good match to the JCPDS pattern. J.S.Huebner, J. Pickrell, T. Schaefer, written communication(USGS 1994)

X Units

cm⁻¹

Y Units

Absorbance

Data Points

1,801