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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U.S. Department of the Interior | U.S. Geological Survey URL: https://pubsdata.usgs.gov/pubs/of/2003/ofr-03-395/DESCRIPT/M/rectorite_isr202.html Questions or Assistance: USGS Web Contact Page Last Modified: Sat Jan 12 23:33 EST 2013