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 GDS116 Tanzania DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS116, GDS116a

MINERAL_TYPE: Phyllosilicate

MINERAL: Muscovite (Mica group)

FORMULA: KAl2Si3O10(OH)2

FORMULA_HTML: KAl₂Si₃O₁₀(OH)₂

COLLECTION_LOCALITY: Tanzania

ORIGINAL_DONOR: C.V. Clemency, SUNY (Jim Post)

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION: Sample is composed of gray/green sand size particles.
GDS116 particle size is not specified.
GDS116a particle size is greater than 37 microns.

IMAGE_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 45.90 wt% SiO₂

COMPOSITION: TiO2 0.46 wt% TiO₂

COMPOSITION: Al2O3 31.06 wt% Al₂O₃

COMPOSITION: Fe2O3 4.35 wt% Fe₂O₃

COMPOSITION: FeO 1.42 wt% FeO

COMPOSITION: MnO 0.05 wt% MnO

COMPOSITION: MgO 1.38 wt% MgO

COMPOSITION: CaO 0.07 wt% CaO

COMPOSITION: Na2O 0.43 wt% Na₂O

COMPOSITION: K2O 10.21 wt% K₂O

COMPOSITION: F 0.11 wt% F

COMPOSITION: H2O+ 4.82 wt% H₂O⁺

COMPOSITION: Total 100.26 wt%

COMPOSITION: O=Cl,F,S 0.05 wt% #correction for Cl, F, S

COMPOSITION: New Total 100.21 wt%

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	SiO2	45.90	wt%	SiO₂
COMPOSITION:	TiO2	0.46	wt%	TiO₂
COMPOSITION:	Al2O3	31.06	wt%	Al₂O₃
COMPOSITION:	Fe2O3	4.35	wt%	Fe₂O₃
COMPOSITION:	FeO	1.42	wt%	FeO
COMPOSITION:	MnO	0.05	wt%	MnO
COMPOSITION:	MgO	1.38	wt%	MgO
COMPOSITION:	CaO	0.07	wt%	CaO
COMPOSITION:	Na2O	0.43	wt%	Na₂O
COMPOSITION:	K2O	10.21	wt%	K₂O
COMPOSITION:	F	0.11	wt%	F
COMPOSITION:	H2O+	4.82	wt%	H₂O⁺
COMPOSITION:	Total	100.26	wt%
COMPOSITION:	O=Cl,F,S	0.05	wt%	#correction for Cl, F, S
COMPOSITION:	New Total	100.21	wt%

Lin, F.C. and C.V. Clemency, 1981, Geochimica and Cosmochimica Acta, v.45, no.4.

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1a2a3a4a # GDS116 # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2_3_4_ # GDS116a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns