DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: GDS123
MIXTURE_TYPE: Intimate
MIXTURE: Beidellite + Montmorillonite
FORMULA: (Na,Ca,0.5)0.3 Al2(Si,Al)4O10(OH)2*nH2O
FORMULA_HTML: (Na,Ca0.5)0.3Al2
(Si,Al)4O10(OH)2
*nH2O
COLLECTION_LOCALITY: Blackjack Mine, Florida Mountain, Idaho
ORIGINAL_DONOR: Jim Post
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Based on XRD sample is a mixture of montmorillonite and beidellite.
IMAGE_OF_SAMPLE: NONE
XRD_ANALYSIS:
Montmorillonite (Major), Beidellite (Major), S. Sutley.
Beidellite plus another phase. XRD identification of beidellite confirmed with the Greene-Kelly test. B. Benzel.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
avg. grain size =
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The spectrum of this sample shows a relatively broad combination absorption centered at 2.19 microns. When compared to the spectrum of spectral library Beidellite+montmorillonite sample GDS124, the greater fwhm of this sample's 2.19 micron absorption is compatible with the presence of minor to major amounts of montmorillonite. G. Swayze.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2b3b4b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
END_SAMPLE_DESCRIPTION.