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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Biotite-Chlorite_Mx BR93-36A DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: BR93-36A
MIXTURE_TYPE: Intimate
MIXTURE: Biotite-Chlorite Fe+2 Bearing Rock (Mica and Chlorite groups)
FORMULA: K(Mg,Fe+2)3(Al,Fe+3)Si3O10(OH)2 and (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6
FORMULA_HTML: K(Mg,Fe+2)3(Al,Fe+3)Si3O10(OH)2 and (Mg,Fe)3(Si,Al)4O10(OH)2-(Mg,Fe)3(OH)6
COLLECTION_LOCALITY: Rodman Mountains, Barstow, CA. USA
COLLECTION_LATITUDE: Not Available # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: Not Available # degrees and decimal minutes (W or E)
DATUM: Not Available # coordinate datum
ORIGINAL_DONOR: Eric Livo
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
pale green Chlorite rich Biotite Quartz Monzonite rock (fresh surface)
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Minor: Quartz, Albite, Microcline
Trace: Biotite, Pyrite
chlorite obvious in spectrum, probably below detection limit of XRD
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
No additional compositional details available.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
IMAGE_OF_SAMPLE: Not Available
SPECTROSCOPIC_DISCUSSION:
Strong iron (Fe+2) absorption features at 0.7 and 1.0, minor OH absorption at 1.4, strong water absorption at 1.9, and strong chlorite features at 2.3 microns, suggest a Mg - rich chlorite with broad Fe+2 absorptions. The 2.3 micron feature is modified by the biotite absorption band.
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: | splib05a r 7503 | 0.2-3.0µm | 200 | g.s.= |
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