TITLE: Nontronite GDS41 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS41

MINERAL_TYPE: Phyllosilicate

MINERAL: Nontronite (Fe-bearing Smectite) (Montmorillonite group)

FORMULA: Na0.33(Fe+3)2(Si,Al)4O10*nH20

FORMULA_HTML: Na0.33Fe+32(Si,Al)4O10•nH2O

COLLECTION_LOCALITY: Wigwam Creek

ORIGINAL_DONOR: None

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Chartruse nontronite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

None

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem


COMPOSITION: SiO2 30.7 wt% SiO2
COMPOSITION: TiO2 <0.02 wt% TiO2
COMPOSITION: Al2O3 20.1 wt% Al2O3
COMPOSITION: Fe2O3 23.0 wt% Fe2O3
COMPOSITION: MnO 0.19 wt% MnO
COMPOSITION: MgO 12.5 wt% MgO
COMPOSITION: CaO 0.77 wt% CaO
COMPOSITION: Na2O <0.15 wt% Na2O
COMPOSITION: K2O 0.62 wt% K2O
COMPOSITION: P2O5 <0.05 wt% P2O5
COMPOSITION: LOI 12.70 wt% LOI
COMPOSITION: Total 100.58 wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total 100.58 wt%

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

Sample from Eugene Foord, USGS, Denver, Colorado.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1_2_3_4_

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment

LIB_SPECTRA: splib04a r 3483 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib05a r ____ 0.2-3.0µm 200 g.s.=

LIB_SPECTRA: splib06a r ____ 1.5-25µm 250 g.s.=