TITLE: Na Alunite + Dickite MV99-6-26b
MATERIAL TYPE: MINERAL
SAMPLE ID: MV99-6-26b
MINERAL TYPE: Intimate mixture
FORMULA:
COLLECTION LOCALITY: Yellow Jacket mine, Antelope Range, Sevier County,
Utah
COLLECTION LOCALITY LAT/LONG: 38º 32’ 3.90” N, 112º 12’
33.66” W
ORIGINAL DONOR: Barnaby W. Rockwell
CURRENT SAMPLE LOCATION: USGS Denver, CO
ULTIMATE SAMPLE LOCATION: USGS Denver, CO
SAMPLE DESCRIPTION:
Highly argillized rock occurring along narrow fracture zone.
XRD ANALYSIS:
Major (>25%): quartz
Minor (5%-25%): natroalunite, dickite
Trace (<5%): gypsum
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 |
2.060 |
2.090 |
2.230 |
2.260 |
| 2 |
1.455 |
1.470 |
1.528 |
1.558 |
| 3 (W) |
2.258 |
2.288 |
2.348 |
2.378 |
SPECTRAL REGION USED FOR CURVE SHAPE COMPETITION: 1.4 - 2.5 µm, Tetracorder group 2
SPECTROSCOPIC DISCUSSION:
Since its addition to the spectral library used for Tetracorder analysis, this mineral mixture has been successfully identified and mapped at several locations, including:
1) at the southern end of the western alteration center at Cuprite, Nevada,
2) in the Goldfield Hills between Preble Mountain and the town of Goldfield, Nevada, and
3) at the Big Star natroalunite mine, Antelope Range, Marysvale volcanic field, Sevier County, Utah.
USGS SPECTRAL LIBRARY LOCATION AND SPECTRAL RANGE: sprlf01a r 364 0.35-2.50µm
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