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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: Rectorite ISR202 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: ISR202

MINERAL_TYPE: Phyllosilicate

MINERAL: Rectorite

FORMULA: Al2Si4O10(OH)2 + (Mg,Fe+2,Al)3(Al,Si)4O10(OH)2*4H2O

FORMULA_HTML: Al2Si4O10(OH)2 + (Mg,Fe+2,Al)3(Al,Si)4O10(OH)2•4H2O

COLLECTION_LOCALITY: Garland County, Arizona

ORIGINAL_DONOR: Not available

CURRENT_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder

ULTIMATE_SAMPLE_LOCATION: CSES/CIRES, Univ. of CO, Boulder

SAMPLE_DESCRIPTION:

Rectorite, a clay mineral, is a regular interstratification of a dioctahedral mica and a dioctahedral smectite.

END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Not Available

END_XRD_ANALYSIS.

COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem

COMPOSITION_TRACE:

COMPOSITION_DISCUSSION:

END_COMPOSITION_DISCUSSION.

MICROSCOPIC_EXAMINATION:

mode:
Rectorite dominates
20 vol% quartz
muscovite & chlorite undetermined

quartz average grain size= 300 µm
all others average grain size= 35 µm

Rectorite forms fine intergrowths with muscovite & chlorite

END_MICROSCOPIC_EXAMINATION.

SPECTROSCOPIC_DISCUSSION:

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1?2_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 4155 0.2-3.0µm 200 g.s.=
LIB_SPECTRA: splib05a r 5865 0.2-3.0µm 200 g.s.=


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