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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: Covellite-Pyrite HS477 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: HS477.2B, HS477.4B, HS477.6

MIXTURE_TYPE: Intimate

MIXTURE: Covellite + Pyrite

FORMULA: CuS + FeS2

FORMULA_HTML: CuS + FeS2

COLLECTION_LOCALITY: Montana

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 7.3-9.5 keV
File: covel477_mdi, *.out (smear mount on quartz plate)
References: JCPDS #6-464, #42-1340; Huebner's reference patterns
Found: Covellite, subequal pyrite, unidentified moderate to weak reflections at 4.72, 3.99, 3.70, 2.84, and 1.857 Angstroms

Comment: Covellite and pyrite reflections are sharp suggesting a good degree of crystallinity and, in the case of covellite, compositional heterogeneity. Additional reflections (6) are of weak to moderate intensity and have not been identified - they may represent two or more phases. Needs more work.

HS477.2B Covellite 40 kV - 30 mA, 7.3-9.5 keV File: covel477.mdi, *.out (smear mount on quartz plate) References-. JCPDS #6-464, #42-1340; Huebner's reference patterns Found: Covellite, subequal pyrite, unidentified moderate to weak reflections at 4.72, 3.99, 3.70, 2.84, and 1.857 A Comment: Covellite and pyrite reflections are sharp suggesting a good degree of crystallinity and, in the case of covellite, compositional heterogeneity. Additional reflections (6) are of weak to moderate intensity and have not been identified - they may represent two or more phases. Needs more work.

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Lead gray metallic luster, trace white impurities. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4b # HS477.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS477.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # HS477.6 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns