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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Magnetite_skarn BR93-5B DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: BR93-5B
MIXTURE_TYPE: Intimate
MIXTURE: Magnetite (Oxide - Spinel group), Phlogopite (Phyllosilicate - Mica group), and Magnesioferrite
FORMULA: Fe+2(Fe+3)2O4, KMg3Si3AlO10(F,OH)2
FORMULA_HTML: Fe+2Fe+32O4, KMg3Si3AlO10(F,OH)2
COLLECTION_LOCALITY: Galway Dry Lake area, 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: U.S.G.S. Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
iron (magnetite) bearing rock within a contact skarn
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Major: Phlogopite
Minor: Magnetite and magnesioferrite
Trace: Albite
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:
Moderate Fe2+ absorption feature at one micron and a strong iron absorption in the ultraviolet. Rock reflectance levels are very low.
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: | splib05a r 8608 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 25904 | g.s.= |