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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Carbon_Black GDS68 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS68
MINERAL_TYPE: Element
MINERAL: Carbon
FORMULA: C
FORMULA_HTML: C
COLLECTION_LOCALITY: Synthetic
ORIGINAL_DONOR: Sargent Welch
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
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 extractable's. 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.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Not Available
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: Other # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | C: | 99.0 | wt% | C |
| COMPOSITION: | volatile: | 0.5 | wt% | volatile |
| COMPOSITION: | unknown: | 0.5 | wt% | unknown |
| COMPOSITION: | Total | 100.0 | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
The sample analysis was by Sargent Welch and consists of 99.0 wt% pure carbon, 0.5 wt% ash, and 0.5 wt% acetone extractable's.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
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.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 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 820 | 0.2-3.0µm | 200 | g.s.= 0.17 µm |
| LIB_SPECTRA: | splib05a r 1533 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 4215 | g.s.= |