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. Sulphides and Sulphates: 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: 1_2_3_4_

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 ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=