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Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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

avg 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: 1_2_3_4_

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 ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=