Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: Calcite + Epidote GDS310 - GDS311 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: GDS310

MIXTURE_TYPE: Intimate

MIXTURE: Calcite + Epidote

FORMULA: CaCO3 and Ca2(Al,Fe+3)3(SiO4)3(OH)

FORMULA_HTML: CaCO₃+Ca2(Al,Fe+3)3(SiO4)3(OH) and Ca₂(Al,Fe⁺³)₃(SiO₄)₃(OH)

COLLECTION_LOCALITY: Calcite from Mexico and Epidote from Prince Wales Island.

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

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 GDS297 (epidote), and GDS298 (calcite) in variable proportions.
67wt% Calcite + 33wt% Epidote GDS310
33wt% Calcite + 67wt% Epidote GDS311

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:

Calcite was ground from pure crystals of iceland spar.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

None

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectra have absorptions characteristic of epidote at 0.4154, 0.4575, 0.4811, 1.0544, and 1.5421 microns. The large absorption at 2.338 microns is mostly due to epidote with some contribution from a superimposed calcite 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 7669	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib05a r 7690	0.2-3.0µm	200	g.s.=

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U.S. Department of the Interior | U.S. Geological Survey URL: https://pubsdata.usgs.gov/pubs/of/2003/ofr-03-395/DESCRIPT/S/constructed_mixtures_calc_epid.html Questions or Assistance: USGS Web Contact Page Last Modified: Sat Jan 12 23:35 EDT 2013