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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Cronstedtite M3542 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: M3542
MINERAL_TYPE: Phyllosilicate
MINERAL: Cronstedtite (Kaolinite-Serpentine group)
FORMULA: Fe+22Fe+3(Si,Fe+3)O5(OH)4
FORMULA_HTML: Fe2+2Fe+3(Si,Fe+3)O5(OH)4
COLLECTION_LOCALITY: Cornwall, England
ORIGINAL_DONOR: Ed Olsen, Field Museum of Natural History
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Agrees with cronstedtite pattern PDF 17-470 (Ed Olsen, personal communication).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
The cronstedtite occurs with quartz and may contain as much as 5% quartz (E. Olsen, personal communication). Spectrally there is no evidence of the presence of quartz.
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 1301 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 2271 | 0.2-3.0µm | 200 | g.s.= |
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