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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: Corrensite CorWa-1 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: CorWa-1

MINERAL_TYPE: Phyllosilicate

MINERAL: Corrensite (Chlorite + Vermiculite) (Chlorite group)

FORMULA: 1to1 interstratified trioctahedral chlorite&vermiculite(Mg,Fe)6(Si,Al)4O10(OH)8+(Mg,Fe+2,Al)3(Al,Si)4O10(OH)2*4H2O

FORMULA_HTML: 1to1 interstratified trioctahedral chlorite&vermiculite(Mg,Fe)6(Si,Al)4O10(OH)8+(Mg,Fe+2,Al)3(Al,Si)4O10(OH)2•4H2O

COLLECTION_LOCALITY: Packwood, Washington

ORIGINAL_DONOR: Clay Mineral Society

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

Interstratified trioctahedral phyllosilicate. Regularly interstratified chlorite and vermiculite.

IMAGE_OF_SAMPLE:
NO PHOTO

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Corrensite + albite + quartz, albite ~8 vol. %, quartz ~4%, corrensite coats albite and quartz grains.

Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res. 12653-12680.

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem

COMPOSITION_TRACE: None

COMPOSITION_DISCUSSION:

Corrensite is a regular 1:1 interstratification of trioctahedral chlorite and trioctahedral smectite or vermiculite.

Clark, R.N., T.V.V. King, M. Klejwa, G. Swayze, and N. Vergo, 1990, High spectral resolution reflectance spectroscopy of minerals: J. Geophys Res. 12653-12680.

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

mode:
88 vol% corrensite
8 vol% albite
4 vol% quartz

Corrensite coats albite and quartz grains and occurs as discrete grains. G. Swayze.

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3c4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns