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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Chlorite + Epidote + Calcite GDS312 - GDS314, GDS319 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: GDS312, GDS313, GDS314, GDS319
MIXTURE_TYPE: Intimate
MIXTURE: Chlorite + Epidote + Calcite
FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6 + Ca2(Al,Fe+3)3(SiO4)3(OH) + CaCO3
FORMULA_HTML: (MgFe)3(SiAl)4O10(OH)2-(MgFe)3(OH)6 +Ca2(Al,Fe+3)3(SiO4)3(OH) + CaCO3
COLLECTION_LOCALITY: Calcite from Mexico and Epidote from Prince Wales Island, and Chlorite from Flagstaff Hill, California.
ORIGINAL_DONOR: Purchased from 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 sieved pure minerals GDS157 (chlorite), GDS297
(epidote), and GDS298 (calcite) in variable proportions.
20wt% Chlorite + 60wt% Epidote + 20 wt% Calcite GDS312
60wt% Chlorite + 20wt% Epidote + 20 wt% Calcite GDS313
20wt% Chlorite + 20wt% Epidote + 60 wt% Calcite GDS314
33wt% Chlorite + 33wt% Epidote + 33 wt% Calcite GDS319
For further information pertaining to this sample see: Dalton, B.J., Bove, D., Mladnich, 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., Mladnich, 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, epidote, and calcite. Because these are intimate mixtures the dark components dominate spectrally. In the 0.35 - 2 micron region the strong Fe absorptions of chlorite dominate the spectra. In the 2 - 2.5 micron region chlorite and epidote absorptions dominate with little evidence of the calcite 2.34 micron absorption.
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 7779 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 7818 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 7841 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 7863 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 24727 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 24766 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 24789 | g.s.= | ||
| LIB_SPECTRA: | splib06a r 24811 | g.s.= |