TITLE: Na Alunite + Kaolinite MV00-11a
MATERIAL TYPE: MINERAL
SAMPLE ID: MV00-11a
MINERAL TYPE: Intimate mixture
FORMULA:
COLLECTION LOCALITY: Alunite Ridge, near Christmas Mine, Tushar Mountains, Piute County, Utah
COLLECTION LOCALITY LAT/LONG: 38º 22’ 46.39” N, 112º 19’ 47.82” W
ORIGINAL DONOR: Barnaby W. Rockwell
CURRENT SAMPLE LOCATION: USGS Denver, CO
ULTIMATE SAMPLE LOCATION: USGS Denver, CO
SAMPLE DESCRIPTION:
Hydrothermally altered wall rock sampled ~50m from K alunite veins formed in high temperature magmatic steam environment. Dark reddish argillized appearance.
XRD ANALYSIS:
Major (>25%): quartz, Na alunite
Minor (5%-25%): kaolinite
Trace (<5%): hematite
COMPOSITIONAL ANALYSIS TYPE: EM(WDS) # XRF,
EM(WDS), ICP(Trace), WChem
Compound/Element |
Composition weight % |
|---|---|
|
SiO2 |
|
|
TiO2 |
|
|
Al2O3 |
|
|
FeO |
|
|
MnO |
|
|
MgO |
|
|
CaO |
|
|
Na2O |
|
|
K2O |
|
| Total |
|
|
O=Cl,F,S |
|
| New Total |
|
COMPOSITION DISCUSSION:
MICROSCOPIC EXAMINATION:
WAVELENGTH INTERVALS OF ABSORPTION FEATURES USED IN SPECTRAL ANALYSIS:
| Absorption |
Left
continuum endpoint |
Right
continuum endpoint |
||
|---|---|---|---|---|
| 1 |
2.067 |
2.097 |
2.244 |
2.274 |
| 2 |
1.455 |
1.469 |
1.499 |
1.529 |
| 3 (W) |
2.265 |
2.295 |
2.343 |
2.373 |
SPECTRAL REGION USED FOR CURVE SHAPE COMPETITION: 1.4 - 2.5 µm, Tetracorder group 2
SPECTROSCOPIC DISCUSSION:
USGS SPECTRAL LIBRARY LOCATION AND SPECTRAL RANGE: sprlf01a r 412 0.35-2.50µm
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