DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS273.1B, HS273.2B, HS273.3B, HS273.4B
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.
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
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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # HS273.1B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # HS273.2B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # HS273.3B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # HS273.4B # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns