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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: Thuringite SMR-15 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SMR15

MINERAL_TYPE: Phyllosilicate

MINERAL: Thuringite (Chlorite Group)

FORMULA: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6

FORMULA_HTML: (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6

COLLECTION_LOCALITY: Not available

ORIGINAL_DONOR: Gene Whitney, U.S.G.S

CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory.

SAMPLE_DESCRIPTION:

Sample was ground in an alumina mortar and pestle and wet sieved with methanol into less than 30µm, 30-45µm, 60-104µm, and 104-150µm size fractions.

King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of Chlorites and Mg-Serpentines Using high-Resolution Reflectance Spectroscopy. Jour. Geophys. Res., 13.997-14,008.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Sample is representative of its structural classification. (King and Clark, 1989). END_XRD_ANALYSIS.

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

COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 24.70 wt% SiO2
COMPOSITION: TiO2 0.69 wt% TiO2
COMPOSITION: Al2O3 21.10 wt% Al2O3
COMPOSITION: Fe2O3 37.50 wt% Fe2O3
COMPOSITION: MnO 0.72 wt% MnO
COMPOSITION: MgO 16.80 wt% MgO
COMPOSITION: CaO 0.40 wt% CaO
COMPOSITION: Na2O 0.32 wt% Na2O
COMPOSITION: K2O 0.03 wt% K2O
COMPOSITION: P2O5 0.30 wt% P2O5
COMPOSITION: LOI 7.50 wt% LOI
COMPOSITION: Total 101.00 wt%

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

Compositional data provided by Gene Whitney, USGS, Denver, CO

King, T.V.V. and R.N. Clark, 1989, Spectral Characteristics of Chlorites and Mg-Serpentines Using high-Resolution Reflectance Spectroscopy. Jour. Geophys. Res., 13.997-14,008.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Microscopically this appears to be pure thuringite. All size fractions were examined visually and by energy dispersive methods to ensure chemical homogeneity as a function of grain size interval.

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 4760 0.2-3.0µm 200 g.s.= 115µm
LIB_SPECTRA: splib04a r 4771 0.2-3.0µm 200 g.s.= 80µm
LIB_SPECTRA: splib04a r 4782 0.2-3.0µm 200 g.s.= 32µm
LIB_SPECTRA: splib04a r 4793 0.2-3.0µm 200 g.s.= 15µm
LIB_SPECTRA: splib05a r 6546 0.2-3.0µm 200 g.s.= 115µm
LIB_SPECTRA: splib05a r 6559 0.2-3.0µm 200 g.s.= 80µm
LIB_SPECTRA: splib05a r 6572 1.3-5.3µm 200 g.s.= 32µm
LIB_SPECTRA: splib05a r 6612 0.2-3.0µm 200 g.s.= 15µm
LIB_SPECTRA: splib05a r 6625 0.2-3.0µm 200 g.s.=


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