Witherite

Spectrum Details

Modality

NIR

Category

mineral

Material Type

Carbonate

Sample ID

HS273.1B, HS273.2B, HS273.3B, HS273.4B

Collection Locality

England

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

Composition / XRD

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

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 = IMAGE_OF_SAMPLE:

XRD Analysis

Pure witherite Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126