TITLE: Thuringite SMR-15 Chlorite DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SMR-15

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: unknown

ORIGINAL_DONOR: Gene Whitney, USGS, Denver

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Sample was ground in an alumina mortar and pestle and wet sieved with methanol into <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: 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 homogenity as a function of grain size interval.

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 4760 0.2-2.7µm 200 g.s.=115µm
LIB_SPECTRA: splib04a r 4771 0.2-2.7µm 200 g.s.=80µm
LIB_SPECTRA: splib04a r 4782 0.2-2.7µm 200 g.s.=32µm
LIB_SPECTRA: splib04a r 4793 0.2-2.7µm 200 g.s.=15µm

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

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