TITLE: Talc + Calcite PC99-1g
MATERIAL TYPE: MINERAL
SAMPLE ID: PC99-1g
MINERAL TYPE: Intimate mixture
FORMULA:
COLLECTION LOCALITY: Waste rock pile, Empire Canyon, Park City mining
district, Summit County, Utah
COLLECTION LOCALITY LAT/LONG: 40º 37' 44.9" N, 111º 30'
4.5" W
ORIGINAL DONOR: Barnaby W. Rockwell
CURRENT SAMPLE LOCATION: USGS Denver, CO
ULTIMATE SAMPLE LOCATION: USGS Denver, CO
SAMPLE DESCRIPTION:
Thermally metamorphosed carbonate-bearing host rock. White, chalky appearance.
XRD ANALYSIS:
Major (>25%): calcite, talc
Minor (5%-25%):
Trace (<5%): quartz, clinochlore, sanidine, apatite, dolomite
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 |
2.238 |
2.268 |
2.337 |
2.367 |
| 2 (W) |
2.337 |
2.367 |
2.398 |
2.428 |
SPECTRAL REGION USED FOR CURVE SHAPE COMPETITION: 1.4 - 2.5 µm, Tetracorder group 2
SPECTROSCOPIC DISCUSSION:
Talc dominates the spectral region surrounding 2.31 µm although calcite is also present in approximately equal amounts.
USGS SPECTRAL LIBRARY LOCATION AND SPECTRAL RANGE: sprlf01a r 373 0.35-2.50µm
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