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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: Pitch_Limonite GDS104 Cu DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS104

MINERAL_TYPE: Hydroxide

MINERAL: Pitch Limonite

FORMULA: [H(Cu,Fe)O2]

FORMULA_HTML: [H(Cu,Fe)O2]

COLLECTION_LOCALITY: Yerrington, NV

ORIGINAL_DONOR: Bill Atkinson, Univ. of Colorado, Boulder

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

45 kV - 35 mA, 7.3-9.5 keV
File: plimo104.out, -.mdi
References: All JCPDS entries for iron oxides-hydroxides-hydrates; Huebner's reference patterns.
Found: not identified

Comment: 4 very weak, very broad reflections at 2.9, 2.6, 1.6, and 1.5 Angstroms. Not much crystallinity.

J.S.Huebner, J. Pickrell, T. Schaefer, written communication 1994

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Bill Atkinson believes that this sample contains significant Cu replacing Fe in the goethite.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Translucent blue grains in photo suggest the presence of another amorphous phase. Perhaps this is regular limonite and the Cu composition comes from the amorphous phase. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1u2_3_4_ # GDS104 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns