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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Chlorite + Calcite GDS315 - GDS316 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: GDS315
MIXTURE_TYPE: Intimate
MIXTURE: Chlorite + Calcite
FORMULA: CaCO3 and (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6
FORMULA_HTML: CaCO3+Ca2(Al,Fe+3)3(SiO4)3(OH) and (MgFe)3(SiAl)4O10(OH)2
-(MgFe)3(OH)6
COLLECTION_LOCALITY: Calcite from Mexico and Chlorite from Flagstaff Hill
California. For further information pertaining to this sample see:
ORIGINAL_DONOR: Purchased Egger's lapidary
COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)
DATUM: Not Available # coordinate datum
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Samples constructed from ground and seived pure minerals GDS157
(chlorite), and GDS298 (calcite) in variable proportions.
33wt% Chlorite + 67wt% Calcite GDS315
67wt% Chlorite + 33wt% Calcite GDS316
For further information pertaining to this sample see: Dalton, B.J., Bove, D., Mladinich, C., Clark, R.N., Rockwell, B., Swayze, G.A., King, T., Church, S., Spectral Classification Of Similar Materials Using the Tetracorder Algorithm: the Calcite-Epidote-Chlorite Problem, Proceedings of the Tenth JPL Airborne Earth Science Workshop, Jet Propulsion Laboratory Publication 02-1, pp.93-101.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Samples were identified as pure.
For further information pertaining to this sample see: Dalton, B.J., Bove, D., Mladinich, C., Clark, R.N., Rockwell, B., Swayze, G.A., King, T., Church, S., Spectral Classification Of Similar Materials Using the Tetracorder Algorithm: the Calcite-Epidote-Chlorite Problem, Proceedings of the Tenth JPL Airborne Earth Science Workshop, Jet Propulsion Laboratory Publication 02-1, pp.93-101.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EM(WDS), ICP(Trace),WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
None
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Spectra have absorptions characteristic of chlorite Because these are intimate mixtures the dark component dominates spectrally. Chlorite spectral features dominate the entire spectra with the presence of calcite indicated only by a slightly deeper 2.3418 micron band relative to the 2.2532 micron band in the calcite rich mixtures.
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: | splib05a r 7885 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 7943 | 0.2-3.0µm | 200 | g.s.= |
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