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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Lepidolite NMNH105541 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH105541
MINERAL_TYPE: Phyllosilicate
MINERAL: Lepidolite (Mica group)
FORMULA: K(Li,Al)3(Si,Al)4O10(F,OH)2
FORMULA_HTML: K(Li,Al)3(Si,Al)4O10(F,OH)2
COLLECTION_LOCALITY: Unknown
ORIGINAL_DONOR: National Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
None
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: lp105538.mdi (smear mount on quartz plate)
References: JSH's Reference Patterns; PDF2 #07-0042, 12-0236, 15-0062, 21-0952, 29-0822,
31-1045, 35-0423, 42-1399.
Found: Mica (species related to lepidolite)
Comment: Peaks are sharp and symmetric. The alpha1-alpha2 components are poorly
resolved, only at high 2 theta. Intense basal reflections dominate the pattern.
The (002) and (003) peaks are stronger than the (001). Computer search-match
routines give suspect results. Manual overlay of numerous mica patterns led
to rejection of lepidolite-12O, 1M-polylithionite, 1M taeniolite, and 2M1 ephesite.
Best matches in terms of numbers (small) and positions of peaks observed are
given by 1M zinnwaldite, 1M taeniolite, 1M matsutomilite, and 3T muscovite.
No single pattern accounted for all observed peaks, but all observed peaks are
found in this set of four mica patterns. Sample forms compact lavendar plates,
suggestive of the lepidolite group.
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:
Spectral comparision with lepidolite NMNH105538 indicates a very close spectral match suggesting this sample is lepidolite.
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 2777 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 4135 | 0.2-3.0µm | 200 | g.s.= |
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