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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Gibbsite WS214 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS214
MINERAL_TYPE: Hydroxide
MINERAL: Gibbsite
FORMULA: Al(OH)3
FORMULA_HTML: Al(OH)3
COLLECTION_LOCALITY: Minas Gerais, Brazil
ORIGINAL_DONOR: Ward Science Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Trimorphous with Bayerite and Nordstrandite.
IMAGE_OF_SAMPLE:
NO PHOTO
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Gibbsite - major component
Trace of unidentified residual.
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
average grain size= 30 µm
Ubiquitous light colored Fe-oxide ? staining. Sample looks pure otherwise; good cleavage, prismatic crystal habit, twinning, crystals too small for determine optical sign. Other optical properties are consistent with gibbsite. G. Swayze.
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 1749 | 0.2-3.0µm | 200 | g.s.= 30 µm |
| LIB_SPECTRA: | splib05a r 2804 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 8111 | g.s.= |