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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Hematite.02+Quartz.98 GDS76 DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: GDS76
MIXTURE_TYPE: Intimate
MIXTURE: Hematite (2%) + Quartz (98%) (Hematite group)
FORMULA: alpha-Fe2O3 + SiO2
FORMULA_HTML: alpha-Fe2O3 + SiO2
COLLECTION_LOCALITY: Laboratory mixture
ORIGINAL_DONOR: Unknown
CURRENT_SAMPLE_LOCATION: USGS Spectroscopy sample collection library - Denver, Colorado
ULTIMATE_SAMPLE_LOCATION: USGS Spectroscopy sample collection library - Denver, Colorado
SAMPLE_DESCRIPTION:
Hematite GDS27 2 wt% + 98 wt% Pure crystal quartz (less than 250 µm grain sizes)
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: hemqtz76_mdi (smear on quartz plate)
References: Huebner's reference patterns; Borg and Smith (1969); PDF2 #33-1161,
33-664
Found: Quartz, trace hematite
Comments: Quartz reflections are extremely sharp with excellent resolution of
alpha1-alpha2 components. Six very weak to barely significant hematite reflections
were observed. The strip chart shows reflections at 3.11, 3.07, 3.06, and 2.66
angstroms; only the 2.66 angstrom peak appears significant in the raw data, and
none are present after routine filtering by Jade. There are several other very
weak reflections (3.11-3.06, 2.66 angstroms) seen only in the strip chart.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: NONE
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
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: | splib04a r 2015 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 8306 | 0.2-3.0µm | 200 | g.s.= |
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