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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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, EPMA, 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