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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: Muscovite GDS111 Guatemala DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS111

MINERAL_TYPE: Phyllosilicate

MINERAL: Muscovite (Fe-rich, Mica group)

FORMULA: KAl2Si3O10(OH)2

FORMULA_HTML: KAl2Si3O10(OH)2

COLLECTION_LOCALITY: Guatemala

ORIGINAL_DONOR: Jim Post

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

IMAGE_OF_SAMPLE:
Photo of sample

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

40 kV - 30 mA, 7.2-9.5 keV
References: Bailey (1984, p. 574), Huebner's reference patterns
Found: dioctahedral mica, 2M1 polytype
Sought but not found: quartz, (100) would be distinct if present

Comments: Very similar patterns. Only mica detected. The mica (004) reflection is at 17.6-17.9 degrees 2 theta; indicating a large alkali such as potassium (the dioctahedral Na-mica, paragonite, has the (004) reflection at 18.4 degrees). The small sample size required smear mounts, which are responsible for a strong preferred basal orientation in each of the patterns."

J.S. Huebner, J. Pickrell, and J. Randow, 1993, written communication.

END_XRD_ANALYSIS.

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


COMPOSITION
KEYWORD		 Oxide
ASCII		 Amount Weight
Percent, %		 Oxide
html
COMPOSITION: SiO2 47.87 wt% SiO2
COMPOSITION: TiO2 0.69 wt% TiO2
COMPOSITION: Al2O3 28.03 wt% Al2O3
COMPOSITION: Fe2O3 7.20 wt% Fe2O3
COMPOSITION: NiO 0.01 wt% NiO
COMPOSITION: MnO 0.07 wt% MnO
COMPOSITION: MgO 0.94 wt% MgO
COMPOSITION: ZnO 0.06 wt% ZnO
COMPOSITION: BaO 0.28 wt% BaO
COMPOSITION: CaO 0.24 wt% CaO
COMPOSITION: K2O 10.16 wt% K2O
COMPOSITION: H2O+ 4.44 wt% H2O+
COMPOSITION: Total 99.99 wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total wt%

Jim Post, personal communication, 1991.

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4a # GDS111 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns