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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Jadeite HS343 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS343

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."

Sieve interval 74 - 250µm.

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.

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, EM(WDS), 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_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 2414 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 3614 0.2-3.0µm 200 g.s.=


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