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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: Celestite HS251 Barite DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS251.1B, HS251.2B, HS251.3B, HS251.4B

MINERAL_TYPE: Sulfate

MINERAL: Celestite (Barite group)

FORMULA: SrSO4

FORMULA_HTML: SrSO4

COLLECTION_LOCALITY: Mexico

ORIGINAL_DONOR: Hunt and Salisbury Collection

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sample originally described in:

Hunt, G.R., Salisbury, J.W., and Lenhoff, C.J., 1971, Visible and Near-Infrared spectra of minerals and rocks: IV. Sulphide's and Sulphate's: Modern Geology, V. 3, p 1-14.

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:

40 kV - 30 mA, 6.5-9.5 keV
Reference: JCPDS #5-593; Huebner's reference pattern.
Found: Celestite.
Sought but not found: quartz - the strong (100) reflection is not present.

Comment: Reflections match the JCPDS card well. However, the reflections are broad rather than sharp, somewhat like my reference pattern (synthetic SrSO4)."

J.S. Huebner, J. Pickrell, and T. Schaefer, 1994, written communication.

END_XRD_ANALYSIS.

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

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # Celestite HS251.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Celestite HS251.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2b3b4b # Celestite HS251.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1b2_3_4_ # Celestite HS251.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns