U.S. Geological Survey home page

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
For more information on the library, see: local link web link

TITLE: Clinochlore_Fe SC-CCa-1 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: SC-CCa-1.a, SC-CCa-1.b, SC-CCa-1.c

MINERAL_TYPE: Phyllosilicate

MINERAL: Ferroan Clinochlore (Ripidolite) (Chlorite Group)

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

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

COLLECTION_LOCALITY: Flagstaff Hill, El Dorado Co., CA

ORIGINAL_DONOR: Clay Mineral Society, Clay Mineral Repository

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 less than 30µm (c), 45-104µm (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.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

This sample is representative of it structural classification. (King and Clark, 1989).

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: EPMA # XRF, EPMA, ICP(Trace), WChem


COMPOSITION
KEYWORD
Oxide
ASCII
Amount Weight
Percent, %
Oxide
html
COMPOSITION: SiO2 33.20 wt% SiO2
COMPOSITION: TiO2 0.85 wt% TiO2
COMPOSITION: Al2O3 25.80 wt% Al2O3
COMPOSITION: Fe2O3 20.70 wt% Fe2O3
COMPOSITION: MnO 0.09 wt% MnO
COMPOSITION: MgO 26.10 wt% MgO
COMPOSITION: CaO less than 0.02 wt% CaO
COMPOSITION: Na2O 0.22 wt% Na2O
COMPOSITION: K2O less than 0.02 wt% K2O
COMPOSITION: P2O5 0.05 wt% P2O5
COMPOSITION: LOI 9.23 wt% LOI
COMPOSITION: Total 100.78 wt%
COMPOSITION: O=Cl,F,S wt% #correction for Cl, F, S
COMPOSITION: New Total 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 ripidolite. 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: 1a2a3a4_ # Clinochlore_Fe SC-CCa-1.a # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # Clinochlore_Fe SC-CCa-1.b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
SPECTRAL_PURITY: 1a2a3a4_ # Clinochlore_Fe SC-CCa-1.c # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns