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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: Galena HS37 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS37.3, HS37.3fg

MINERAL_TYPE: Sulfide

MINERAL: Galena

FORMULA: PbS

FORMULA_HTML: PbS

COLLECTION_LOCALITY: Galena, Kansas

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Clausthalite.

Galena is usually pure, in the sense that substitution of other metal ions for lead is not very extensive. This sample appears quite pure, containing only a very minor amount of sphalerite. The largest size particles are opaque throughout the spectral region because of intense absorption in the conduction band which extends into the infrared.

Hunt, G.R., J.W. Salisbury, C.J. Lenhoff, 1971, Visible and Near-Infrared spectra of Minerals and Rocks: IV. Sulphides and Sulphates. Mod. Geol. 3, pp 1-14.

Grain size fractions are indicated by the extension after the sample number:
.3 = 74-250 µm (compared to HS samples with the .3B extension, a grinding process was used which resulted in trace metal shavings from grinder)
.3fg = ground to a finer grain size (unspecified) than the .3 sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure galena.

Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

mode:
98 vol% galena
2 vol% sphalerite

avg. grain size = 290 µm

Cubic cleavage, gray metallic luster consistent with galena. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4_ # Galena HS37.3 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Galena HS37.3fg # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns