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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Andradite WS474 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS474
MINERAL_TYPE: Nesosilicate
MINERAL: Andradite (Garnet group)
FORMULA: Ca3(Fe3+)2(SiO4)3
FORMULA_HTML: Ca3Fe3+2(SiO4)3
COLLECTION_LOCALITY: Navajo Reservation, Arizona
ORIGINAL_DONOR: Ward Science Collection
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms two series with Grossular and with Schorlomite.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 7.3-9.5 keV
File: pyro474.out, *.mdi
References: Borg and Smith (1969), JCPDS #15-742, DHZ, v. 1a (1982), Huebner's
reference patterns
Found: Garnet; unindexed weak reflection at 3.32 Angstroms
Comment: Sharp reflections indicate good degree of crystallization and suggest
chemical homogeneity. Garnet ao=12.00 Angstroms, inconsistent with pyrope but
consistent with a andradite-rich or uvarovite-rich composition. On the basis of
brown color, the garnet composition is andradite-rich. The weak unindexed
reflection is consistent with the possible presence of a trace of a feldspar.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: EM(WDS) # XRF, EM(WDS), ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 35.855 | wt% | SiO2 |
| COMPOSITION: | TiO2 | 0.033 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 0.085 | wt% | Al2O3 |
| COMPOSITION: | Cr2O3 | 0.011 | wt% | Cr2O3 |
| COMPOSITION: | V2O3 | 0.011 | wt% | V2O3 |
| COMPOSITION: | FeO | 30.817 | wt% | FeO |
| COMPOSITION: | NiO | 0.014 | wt% | NiO |
| COMPOSITION: | MnO | 0.676 | wt% | MnO |
| COMPOSITION: | MgO | 0.041 | wt% | MgO |
| COMPOSITION: | CaO | 33.509 | wt% | CaO |
| COMPOSITION: | Total | 101.06 | wt% |
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_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 4049 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib05a r 1012 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 2318 | g.s.= |