Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Jadeite HS343 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS343.1B, HS343.2B, HS343.3B, HS343.4B, HS343.6

MINERAL_TYPE: Inosilicate

MINERAL: Jadeite (Pyroxene group)

FORMULA: Na(Al,Fe+3)Si2O6

FORMULA_HTML: Na(Al,Fe⁺³)Si₂O₆

COLLECTION_LOCALITY: California

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"I-9 Jadeite 343B-California. NaAlSi₂O₆: Jadeite is a comparatively rare pyroxene of metamorphic origin, which is one source of gem quality jade. Ferric iron commonly substitutes for aluminum, which yields the band near 0.8µ and the fall off to the blue. There are very weak ferrous ion features near 1.0µ, as well as weak water bands from fluid inclusions near 1.9 and 2.25µ."

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 = <5 µm
.2B = <74 µm
.3B = 74-250 µm
.4B = 250-1200 µm
.6 = cut slab

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
File: jadit343.out, -.mdi
Reference: Borg and Smith (1969)
Found: jadeite + analcite (trace)
Sought but not found: quartz, albite, calcite, aragonite

Comment: Strong, sharp reflections indicate high degree of crystallinity. The analcite identification is based on two distinct reflections (a third should be obscured by the jadite (-221)) and its common association with jadeite.

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Not done yet

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # Jadeite HS343.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Jadeite HS343.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2c3b4u # Jadeite HS343.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Jadeite HS343.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Jadeite HS343.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns