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Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

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.

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: EM(WDS) # XRF, EM(WDS), 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: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib04a r 3885 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 5414 0.2-3.0µm 200 g.s.=


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