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: 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)

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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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

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U.S. Department of the Interior | U.S. Geological Survey URL: https://pubsdata.usgs.gov/pubs/of/2003/ofr-03-395/DESCRIPT/M/hematite_gds27.html Questions or Assistance: USGS Web Contact Page Last Modified: Sat Jan 12 23:31 EST 2013