|
|
(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Hematite HS45 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS45
MINERAL_TYPE: Oxide
MINERAL: Hematite (Hematite group)
FORMULA: alpha-Fe2O3
FORMULA_HTML: alpha-Fe2O3
COLLECTION_LOCALITY: Ironton, MN
ORIGINAL_DONOR: Hunt and Salisbury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Dimorphous with Maghemite.
The spectrum of this sample was originally published in:
Hunt, G.R., J.W. Salisbury, and C.J. Lenhoff, 1971, Visible and near-infrared spectra of minerals and rocks: III. Oxides and hydroxides. Modern Geology, v. 2, p. 195-205.
With the note that "this sample departs considerably from a pure stoichiometric single crystal, but is typical of naturally occurring hematite."
The sample measured for the library was HS45.3 which was dry sieved to the grain size interval 74-250µm.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 7.3-9.5 keV
File: hemat45.mdi, *.out (smear mount on quartz plate)
References: Huebner's reference patterns
Found: Hematite; traces of quartz and a 7 angstrom phase
Comment: Strong, narrow, symmetric hematite reflections
indicate excellent crystallinity and suggest compositional heterogeneity.
Hematite peak positions are consistent with Fe2O3 composition. The
quartz identification is based upon two very weak (and broad) reflections. Very
weak reflections at 7.2 and 3.55 angstroms indicate the presence of a 7
or 14 angstroms phase (possibly chlorite).
J.S. Huebner, J. Pickrell, and T. Schaefer, written communication 1994
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
None.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_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 2113 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 3273 | 0.2-3.0µm | 200 | g.s.= |
| AccessibilityFOIAPrivacyPolicies and Notices | |
 |
|