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: Phlogopite_Sand_Mix BR93-20 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: BR93-20

MIXTURE_TYPE: Intimate

MIXTURE: Phlogopite (mica group) bearing sandy soil

FORMULA: K(Mg,Fe+2)3AlSi3O10(OH,F)2

FORMULA_HTML: K(Mg,Fe⁺²)₃AlSi₃O₁₀(OH,F)₂

COLLECTION_LOCALITY: Red Hill area, Barstow California, 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 Spectral Library Denver, Colorado

ULTIMATE_SAMPLE_LOCATION: USGS Spectral Library Denver, Colorado

SAMPLE_DESCRIPTION:

Phlogopite (altered biotite) -rich sandy alluvial-fan soil

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Major component: phlogopite
Minor components: albite, microcline, and chlorite-clinochlorite
Trace components: actinolite, magnesiohornblende
XRD analysis by: Steve Sutley

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:

generic - very broad Fe²⁺ one micron absorption band. The spectral feature at 2.32 microns contains a sharp phlogopite band center with broad chlorite wings on either side.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns