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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
For more information on the library, see: local link web link

TITLE: Spodumene HS210 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS210.1B, HS210.2B, HS210.3B, HS210.4B

MINERAL_TYPE: Inosilicate

MINERAL: Spodumene (Pyroxene group)

FORMULA: LiAlSi2O6

FORMULA_HTML: LiAlSi2O6

COLLECTION_LOCALITY: Afghanistan

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

"I-7 Spodumene 210B-Afganistan. LiAlSi2O6: Spodumene is a characteristic mineral of lithium-rich granite pegmatites. It usually does not have a wide range of composition, but this sample contains enough ferrous iron to provide the broad weak band near 1.0µ and the fall off to the blue in the visible. In addition, water bands at 1.4µ and 1.9µ are evident, and the quite sharp feature near 2.2µ is a combination band of the OH stretching mode. These bands are due to a surprising small amount of clay mineral deposited in microfractures in the spodumene."

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

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Spodumene + quartz + trace muscovite (Norma Vergo).

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

The presence of sharp absorptions at 1.4 and 2.2 microns are consistent with the xrd determined presence of muscovite. G. Swayze.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1c2_3_4_ # HS210.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1c2_3_4_ # HS210.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1c2c3c4_ # HS210.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1c2_3_4_ # HS210.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns