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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Glauconite HS313 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: HS313
MINERAL_TYPE: Phyllosilicate
MINERAL: Glauconite (Mica group)
FORMULA: (K,Na)(Fe+3,Al,Mg)2(Si,Al)4O10(OH)2
FORMULA_HTML: (K,Na)(Fe+3,Al,Mg)2(Si,Al)4O10(OH)2
COLLECTION_LOCALITY: South Dakota
ORIGINAL_DONOR: Hunt and Salibury Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Sample measured was HS313.3B which was dry sieved to the grain size interval 74-250 µm.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Quartz - major component
1M mica (phlogopite, glauconite) - major component
Konnert, Judith and Marta Flohr, 1992, unpublished data, USGS Reston, VA.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:
No analysis.
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Optical examination gives the following mineral mode:
70 vol% glauconite
population 1: average grain size= 230µm 65 vol%
population 2: average grain size= 8µm 5 vol%
30 vol% quartz and feldspar grains
population 3: average grain size= 260µm 30 vol%
average grain size populations = 234µm
Large rounded glauconite grains whose surfaces are 60% covered with smaller glauconite. Some of the quartz and feldspar grains are Fe-stained and partially glauconite coated. Glauconite grains have slight yellow-green pleochroism. G. Swayze
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1c2_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 1760 | 0.2-3.0µm | 200 | g.s.= 234 µm |
| LIB_SPECTRA: | splib05a r 2816 | 0.2-3.0µm | 200 | g.s.= |
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