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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Chlorite + Epidote GDS317 - GDS318 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: GDS317
MIXTURE_TYPE: Intimate
MIXTURE: Chlorite + Epidote
FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6 and Ca2(Al,Fe+3)3(SiO4)3(OH)
FORMULA_HTML: (MgFe)3(SiAl)4O10(OH)2-(MgFe)3(OH)6 and Ca2(Al,Fe+3)3(SiO4)3(OH)
COLLECTION_LOCALITY: 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 seived pure minerals GDS157 (chlorite), GDS297
(epidote)in variable proportions.
67wt% Chlorite + 33wt% Epidote GDS317
33wt% Chlorite + 67wt% Epidote GDS318
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 epidote indicated only by a slightly deeper 2.3407 micron band in the epidote rich mixture and a weak epidote absorption at 1.54 microns.
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 7921 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 7965 | 0.2-3.0µm | 200 | g.s.= |
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