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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Witherite HS273 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS273
MINERAL_TYPE: Carbonate
MINERAL: Witherite (Aragonite group)
FORMULA: BaCO3
FORMULA_HTML: BaCO3
COLLECTION_LOCALITY: England
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
C-10 Witherite. England (64, hand-ground). Witherite, BaCO3, is a comparatively rare mineral, usually found in hydrothermal veins associated with galena. Like strontianite, witherite is a member (and isostructure) of the aragonite group, and displays only carbonate bands. Witherite is normally fairly pure BaCO3, and this sample is no exception."
Hunt, G.R., J.W. Salisbury, 1971, Visible and near-infrared spectra of minerals and rocks: II. Carbonates. Modern Geology, v. 2, p. 23-30.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure witherite
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2a3a4_ # 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 5159 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 7025 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 23583 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 23595 | g.s.= |