TITLE: Carbon_Black GDS68 DESCRIPT
ORIGINAL_DONOR: Sargent Welch
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
The sample and the visible-NIR spectrum was originally published in:
Clark, R.N., 1983, Spectral Properties of Mixtures of Montmorillonite and Dark Carbon Grains: Implications for Remote Sensing Minerals Containing Chemically and Physically Adsorbed Water: J. Geophys. Res., v. 88, p. 10635-10644.
The sample was manufactured by Sargent Welch (in about 1980) and consists of 99.0 wt% pure carbon, 0.5 wt% ash, and 0.5 wt% acetone extractables. The sample was examined with scanning electron microscopy (SEM) and the grain size is quite uniform at 0.17 µm. Note that the Clark 1983 spectrum has too high a reflectance due to scattered light in the UH spectrometer.
COMPOSITIONAL_ANALYSIS_TYPE: Other # XRF, EM(WDS), ICP(Trace), WChem
The sample analysis was by Sargent Welch and consists of 99.0 wt% pure carbon, 0.5 wt% ash, and 0.5 wt% acetone extractables.
SEM shows the grains to be spherical with a 0.17 µm diameter. No visible contamination under x-polarized light. Clumps range in size greater than 0.17µm.
LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 820 0.2-3.0µm 200 g.s.=0.17 µm
LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=