U.S. Geological Survey home page


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: 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:

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, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Bill Atkinson believes that this sample contains significant Cu replacing Fe in the goethite.
It is not unusual for goethite to be X-ray amorphous. See Swayze et al., Using imaging spectroscopy to map acidic mine waste, Environmental Science and Technology, v. 34, p. 47-54, 2000.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1?2_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: splib04a r 3926 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 5460 0.2-3.0µm 200 g.s.=


USA.gov logo  Take Pride in America button