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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: 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, EM(WDS), 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_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: 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 1963 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 8294 0.2-3.0µm 200 g.s.=


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