U.S. Geological Survey home page


Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Celestite HS251 Barite DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: HS251

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.

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, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 862 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 1578 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button