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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Pyrophyllite SU1421 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: SU1421
MINERAL_TYPE: Phyllosilicate
MINERAL: Pyrophyllite
FORMULA: Al2Si4O10(OH)2
FORMULA_HTML: Al2Si4O10(OH)2
COLLECTION_LOCALITY: unknown
ORIGINAL_DONOR: Ron Lyons, Stanford University
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: pyrp1421.mdi (smear on quartz plate)
References: Huebner's reference patterns; PDF #12-203, 16-0344,
12-0203
Sought: Talc, Montmorillonite, Kaolinite, Chlorite, Paragonite,
Phlogopite
Found: Pyrophyllite, mica, minor quartz.
Comment: Pattern dominated by very strong basal pyrophyllite peaks having excellent
alpha1-alpha2 resolution at high 2 theta resolution. Non-basal pyrophyllite
reflections are weak. The pyrophyllite 2M1 (PDF2 #12-0203) is a much better
match than triclinic pyrophyllite (25-0022). Unit cell refinement using nine
lattice spacing's, using the positions of the quartz peaks as an internal standard,
yields a=5.161(4), b=8.934(14), c=18.650(6) angstroms and beta=99.68(5) degrees.
Unindexed peaks at 7.63 (moderate), 7.16, 3.80, 3.58, and 3.24 angstroms (all
weak) indicate the presence of a fourth phase.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_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 4081 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 5783 | 0.2-3.0µm | 200 | g.s.= |
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