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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: Phlogopite WS496 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: WS496

MINERAL_TYPE: Phyllosilicate

MINERAL: Phlogopite (Mica group)

FORMULA: KMg3Si3AlO10(F,OH)2

FORMULA_HTML: KMg3Si3AlO10(F,OH)2

COLLECTION_LOCALITY: Mt. Vesuvius, Italy

ORIGINAL_DONOR: Ward's Scientific

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Biotite.

Original sample labeled as humite and phlogopite.

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 6.5-9.5 keV
File: phlog496.out, -.mdi (edge/random mount)
References: Bailey (1988, MSA Reviews 13); Huebner's reference patterns
Found: trioctahedral mica (3T or 1M polytype); very minor calcite.

Comment: Exceptionally sharp reflections suggest excellent crystallinity and compositional heterogeneity. It is difficult or impossible to distinguish 1M and 3T polytypes in powder diffraction patterns; WS-496 seem to match Bailey's 3T reference pattern intensities better than his 1M intensities. WS-496 is definitely not 2M1 polytype. The position of the (060) [or(30-30)] reflection is consistent with endmember phlogopite.

J.S. Huebner, J. Pickrell, T. Schaefer, written communication(USGS)

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem


COMPOSITION
KEYWORD		 Oxide
ASCII		 Amount Weight
Percent, %		 Oxide
html
COMPOSITION: SiO2 43.015 wt% SiO2
COMPOSITION: TiO2 .075 wt% TiO2
COMPOSITION: Al2O3 11.605 wt% Al2O3
COMPOSITION: FeO 3.444 wt% FeO
COMPOSITION: MnO .435 wt% MnO
COMPOSITION: MgO 29.624 wt% MgO
COMPOSITION: CaO .052 wt% CaO
COMPOSITION: Na2O .322 wt% Na2O
COMPOSITION: K2O 9.073 wt% K2O
COMPOSITION: Cl .005 wt% Cl
COMPOSITION: F 2.193 wt% F
COMPOSITION: Total 99.84 wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Microprobe analysis by Gregg Swayze using USGS microprobe facility.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2c3c4_ # WS496 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns