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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_Coatd_Qtz BR93-25B DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: BR93-25B

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

MIXTURE: Hematite and Quartzite

FORMULA: Fe2O3 and SiO2

FORMULA_HTML: Fe2O3 and SiO2

COLLECTION_LOCALITY: Red Hill, Fry Mountains, Southeast of 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:

Hematite coating on muscovite bearing quartzite occurring as fracture fills in a shear zone near the top of the hill.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Major: Quartz
Minor: Muscovite, Albite, Microcline
Trace: Hematite
Note: XRD is of the rock, not just the hematite measured spectrally.

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:

strong hematite absorption features in the visible - near-IR (0.3 - 0.55 and 0.88 microns), moderate kaolinite absorption feature doublet at 2.2 microns, and and weak muscovite feature at 2.2 microns.
This spectrum is identified as being from medium grained hematite.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b_2_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 9127 0.2-3.0µm 200 g.s.=


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