Clark and others 2007 USGS Data Series 231
Spectral Library splib06a Sample Description

(For further information on spectroscopy, see: http://speclab.cr.usgs.gov)

TITLE: Hematite_Coatd_Qtz BR93-34C DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: BR93-34C

MIXTURE_TYPE: Coating # Areal, Intimate, Coating, or Molecular

MIXTURE: Hematite and Quartzite

FORMULA: Fe2O3 and SiO2

FORMULA_HTML: Fe₂O₃ and SiO₂

COLLECTION_LOCALITY: Rodman Mountains, Near Barstow, CA, USA

COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)

DATUM: Not Available # coordinate datum

ORIGINAL_DONOR: Eric Livo

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Strong coating of hematite on a muscovite bearing quartzite (The spectral measurement is principally of the hematite coating, not the underlying rock).

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Major: Quartz Minor: Hematite Trace: Pinnoite

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

No additional compositional details available.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

IMAGE_OF_SAMPLE: Not Available

SPECTROSCOPIC_DISCUSSION:

Hematite spectral absorption features are seen with an intense ultraviolet-centered absorption from 0.3 to 0.55 microns, a feature at 0.66, and a strong feature at 0.88 microns. A hint of an OH absorption feature (clay or mica) is seen at 2.2 microns. This spectrum is identified as being from coarse grained hematite.

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:	splib05a r 9138	0.2-3.0µm	200	g.s.=
LIB_SPECTRA:	splib06a r 26767			g.s.=