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
_{For more information on the library, see:
local link
web link}

TITLE: pyrophyllite+muscovite JH_PYRM1 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: JH_PYRM1

MIXTURE_TYPE: Intimate

MIXTURE: Pyrophyllite + Muscovite

FORMULA: Al2Si4O10(OH)2 + KAl2[AlSi3O10](OH,F)2

FORMULA_HTML: Al₂Si₄O₁₀(OH)₂ + KAl₂[AlSi₃O₁₀](OH,F)₂

COLLECTION_LOCALITY: east ridge Jupiter Hill, Park City, UT USA

ORIGINAL_DONOR: Barnaby Rockwell

COLLECTION_LATITUDE: N40deg 36.740' # degrees and decimal minutes (N or S)

COLLECTION_LONGITUDE: W111deg 32.124' # degrees and decimal minutes (W or E)

DATUM: NAD27 # coordinate datum

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Lab ASD spectrum of altered fissure zone, east ridge Jupiter Hill. Quartz + minor pyrophyllite (5-25%) + trace muscovite (<5%). High grade argillic alteration along ENE-trending fault zone

See: Rockwell, B.W.,2002, Descriptions, spectral plots, and digital reflectance spectra of samples applied to spectral analysis of imaging spectroscopy data: Utah (East Tintic Mountains, Oquirrh Mountains, Wasatch Mountains, and Tushar Mountains), Nevada (Goldfield Hills), and New Mexico (Jemez Mountains), USA, 1999-2002: U.S. Geological Survey Open-File Report 02-407, electronic web pages. (http://pubs.usgs.gov/of/2002/ofr-02-407)

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

quartz + minor pyrophyllite (5-25%) + trace muscovite (<5%)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EPMA,WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

None

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

None

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

Spectrum has absorptions characteristic of both pyrophyllite and muscovite. Both minerals have absorptions that overlap near 1.4 and 2.2 microns. It is unknown if the weak absorption at 0.954 microns is an artifact or real absorption.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns