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