Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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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, EPMA, 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