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: Muscovite GDS107 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS107

MINERAL_TYPE: Phyllosilicate

MINERAL: Muscovite (Mica group)

FORMULA: KAl2Si3O10(OH)2

FORMULA_HTML: KAl₂Si₃O₁₀(OH)₂

COLLECTION_LOCALITY: Mt. Turner, Australia

ORIGINAL_DONOR: Jim Crowley, USGS Reston

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
File: muscv107.mdi (smear on quartz plate)
References: Huebner's reference patterns; Bailey (1988); JCPDS #06-0263
Found: Dioctahedral 2M1 mica (probably muscovite)

Comment: Pattern contains strong, narrow basal reflections and weak to moderate, broad non-basal reflections. The alpha1-alpha2 reflections are not resolved. Comparison with strip charts indicates the mica is dioctahedral. Using the criteria of Bailey (1988) for muscovite polytypes, the mica is 2M1. The pattern is very similar to that of JCPDS #06-0263, a 2M1 muscovite. The position of the (004) reflection indicates that the mica is potassic.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4_ # GDS107 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns