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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: Clinochlore NMNH83369 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: NMNH83369

MINERAL_TYPE: Phyllosilicate

MINERAL: Mg-Clinochlore (Chlorite group)

FORMULA: (Mg,Fe+2)5Al(Si3Al)O10(OH)8

FORMULA_HTML: (Mg,Fe+2)5Al(Si3Al)O10(OH)8

COLLECTION_LOCALITY: Tilly Foster mine, Brewster, New York

ORIGINAL_DONOR: National Museum of Natural History (Jim Crowley)

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Forms series with Chamosite, Chlorite group.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Pure magnesium clinochlore (Jim Crowley).

END_XRD_ANALYSIS.

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


COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 32.0 wt% SiO2
COMPOSITION: TiO2 less than 0.02 wt% TiO2
COMPOSITION: Al2O3 16.0 wt% Al2O3
COMPOSITION: Fe2O3 3.76 wt% Fe2O3
COMPOSITION: MnO less than 0.02 wt% MnO
COMPOSITION: MgO 33.9 wt% MgO
COMPOSITION: CaO 0.09 wt% CaO
COMPOSITION: Na2O less than 0.15 wt% Na2O
COMPOSITION: K2O 0.07 wt% K2O
COMPOSITION: P2O5 less than 0.05 wt% P2O5
COMPOSITION: Total wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total wt%

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

XRF analysis by Joe Taggart and A. Bartel of the USGS

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

Basal cleavage, pale green color, scaly aggregates, first order gray interference color, low relief, all consistent with chlorite. Trace magnetite and epidote(?). G. Swayze.

plates 35 µm thick and 500 µm in diameter.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2_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 1064 0.2-3.0µm 200 g.s.= 500 µm
LIB_SPECTRA: splib05a r 1924 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 1937 1.3-5.3µm 200 g.s.=


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