TITLE: Prochlorite SMR-14 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SMR-14

MINERAL_TYPE: Phyllosilicate

MINERAL: Prochlorite (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 (c), 30-45µm (b), and 104-150µm (a) 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:

This sample was found to be 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 19.90 wt% SiO2
COMPOSITION: TiO2 5.38 wt% TiO2
COMPOSITION: Al2O3 15.20 wt% Al2O3
COMPOSITION: Fe2O3 35.10 wt% Fe2O3
COMPOSITION: MnO 0.57 wt% MnO
COMPOSITION: MgO 16.80 wt% MgO
COMPOSITION: CaO 0.02 wt% CaO
COMPOSITION: Na2O 0.20 wt% Na2O
COMPOSITION: K2O 0.02 wt% K2O
COMPOSITION: P2O5 0.05 wt% P2O5
COMPOSITION: LOI 7.10 wt% LOI
COMPOSITION: Total 100.34 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 prochlorite. All size fractions were examined visually and by energy dispersive methods to ensure chemical homogeneity as a function of grain size interval. (T. King)

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 3956 0.2-2.7µm 200 g.s.=115µm

LIB_SPECTRA: splib04a r 3967 0.2-2.7µm 200 g.s.=32µm

LIB_SPECTRA: splib04a r 3978 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.=