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, 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