Sample Description USGS Spectral Library Version 7

USGS Spectral Library Version 7 Sample Description

Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., Driscoll, R.L., and Klein, A.J., 2017, USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035, 61 p., https://doi.org/10.3133/ds1035
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TITLE: Beidellite GDS124 DESCRIPT

DOCUMENTATION_FORMAT: MINERAL

SAMPLE_ID: GDS124

MINERAL_TYPE: Phyllosilicate

MINERAL: Beidellite (Montmorillonite group)

FORMULA: (Na,Ca,0.33 Al2[Si3.5Al0.5O10(OH)2]*nH2O

FORMULA_HTML: (Na,Ca_0.5)_0.3Al₂(Si,Al)₄O₁₀(OH)₂*nH₂O

COLLECTION_LOCALITY: Idawa Mine, Florida Mountain, Idaho

ORIGINAL_DONOR: Jim Post

CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory

SAMPLE_DESCRIPTION:

XRD indicates the presence of Beidellite.

IMAGE_OF_SAMPLE: NONE
END_SAMPLE_DESCRIPTION.

XRD_ANALYSIS:

Montmorillonite (Major), Beidellite (Major), Sutley, 2005.

XRD indicates pure beidellite. XRD presence of beidellite confirmed by 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 narrowness of the 2.18 micron absorption suggests that this sample has considerably more beidellite if montmorillonite is even present. Spectroscopy supports the interpretation that this may be a nearly pure sample of beidellite. G. Swayze.

END_SPECTROSCOPIC_DISCUSSION.

SPECTRAL_PURITY: 1b2b3b4b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns