Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
_{For more information on the library, see:
local link
web link}

TITLE: Calcite + Epidote GDS310 - GDS311 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: GDS310, GDS311

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 sieved 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., 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, EPMA, 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