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: Halloysite+Kaolinite CM29 DESCRIPT

DOCUMENTATION_FORMAT: MIXTURE

SAMPLE_ID: CM29

MIXTURE_TYPE: Intimate

MIXTURE: Halloysite + Kaolinite (Kaolinite-Serpentine group)

FORMULA: Al2Si2O5(OH)4

FORMULA_HTML: Al₂Si₂O₅(OH)₄

COLLECTION_LOCALITY: Wagon Wheel Gap, Colorado

ORIGINAL_DONOR: Clay Mineral Standard, Ward Natural Science Inc.

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Polymorphous with Dickite, Kaolinite, and Nacrite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Disordered kaolinite - a mixture of kaolinite and halloysite (from NIR data)] (Norma Vergo)

END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD Oxide
ASCII Amount Weight
Percent, % Oxide
html

COMPOSITION: SiO2 43.8 wt% SiO₂

COMPOSITION: TiO2 less than 0.02 wt% TiO₂

COMPOSITION: Al2O3 37.8 wt% Al₂O₃

COMPOSITION: Fe2O3 0.71 wt% Fe₂O₃

COMPOSITION: FeO 0.03 wt% FeO

COMPOSITION: MnO less than 0.02 wt% MnO

COMPOSITION: MgO 0.11 wt% MgO

COMPOSITION: CaO 0.22 wt% CaO

COMPOSITION: Na2O less than 0.15 wt% Na₂O

COMPOSITION: K2O less than 0.06 wt% K₂O

COMPOSITION: P2O5 0.21 wt% P₂O₅

COMPOSITION: H2O+ 14.8 wt% H₂O⁺

COMPOSITION: H2O- 0.80 wt% H₂O^-

COMPOSITION: H2O 15.6 wt% H₂O

COMPOSITION: LOI 15.4 wt% LOI

COMPOSITION: Total wt%

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

COMPOSITION: New Total wt%

COMPOSITION KEYWORD	Oxide ASCII	Amount	Weight Percent, %	Oxide html
COMPOSITION:	SiO2	43.8	wt%	SiO₂
COMPOSITION:	TiO2	less than 0.02	wt%	TiO₂
COMPOSITION:	Al2O3	37.8	wt%	Al₂O₃
COMPOSITION:	Fe2O3	0.71	wt%	Fe₂O₃
COMPOSITION:	FeO	0.03	wt%	FeO
COMPOSITION:	MnO	less than 0.02	wt%	MnO
COMPOSITION:	MgO	0.11	wt%	MgO
COMPOSITION:	CaO	0.22	wt%	CaO
COMPOSITION:	Na2O	less than 0.15	wt%	Na₂O
COMPOSITION:	K2O	less than 0.06	wt%	K₂O
COMPOSITION:	P2O5	0.21	wt%	P₂O₅
COMPOSITION:	H2O+	14.8	wt%	H₂O⁺
COMPOSITION:	H2O-	0.80	wt%	H₂O^-
COMPOSITION:	H2O	15.6	wt%	H₂O
COMPOSITION:	LOI	15.4	wt%	LOI
COMPOSITION:	Total		wt%
COMPOSITION:	O=Cl,F,S		wt%	#correction for Cl, F, S
COMPOSITION:	New Total		wt%

COMPOSITION_TRACE:

None

COMPOSITION_DISCUSSION:

Analysis by J. Taggart, Ardith J. Bartel, K. Stewart
Analysis by E. Brandt, J. H. Christie

Induced Coupled Plasma trace analysis exists but is not yet included.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

average grain size = 300 µm

Sample is isotropic in cross-polarized light. Clumps of plates? visible under microscope. Plates suggest kaolinite, but SEM work I have done on this sample shows at least some grains are hollow tubes which indicates sample is partially halloysite. This sample is then probably a mix of kaolinite and halloysite. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

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