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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Hematite GDS27 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS27
MINERAL_TYPE: Oxide
MINERAL: Hematite (Hematite group)
FORMULA: alpha-Fe2O3
FORMULA_HTML: alpha-Fe2O3
COLLECTION_LOCALITY: Baker Analyzed Reagent (synthetic)
ORIGINAL_DONOR: Baker Chemical
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Dimorphous with Maghemite.
Baker Analyzed Reagent. Grade: 1-2024. Trace: P04, SO4, Ca, Mn, Zn (< .04% of each)
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure hematite
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
average grain size = 200 µm (aggregates)
Material opaque, but hematite red in powdered form. No impurities observed. Large 50-150 µm grain aggregates are composed of 2-3 µm grains. G. Swayze.
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 2025 | 0.2-3.0µm | 200 | g.s.= 200 µm |
| LIB_SPECTRA: | splib05a r 3169 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 9282 | g.s.= |