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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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