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DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: NMNH83369
MINERAL_TYPE: Phyllosilicate
MINERAL: Mg-Clinochlore (Chlorite group)
FORMULA: (Mg,Fe+2)5Al(Si3Al)O10(OH)8
FORMULA_HTML: (Mg,Fe+2)5Al(Si3Al)O10(OH)8
COLLECTION_LOCALITY: Tilly Foster mine, Brewster, New York
ORIGINAL_DONOR: National Museum of Natural History (Jim Crowley)
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Forms series with Chamosite, Chlorite group.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Pure magnesium clinochlore (Jim Crowley).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EPMA, ICP(Trace), WChem
| COMPOSITION KEYWORD |
Oxide ASCII |
Amount | Weight Percent, % |
Oxide html |
|---|---|---|---|---|
| COMPOSITION: | SiO2 | 32.0 | wt% | SiO2 |
| COMPOSITION: | TiO2 | less than 0.02 | wt% | TiO2 |
| COMPOSITION: | Al2O3 | 16.0 | wt% | Al2O3 |
| COMPOSITION: | Fe2O3 | 3.76 | wt% | Fe2O3 |
| COMPOSITION: | MnO | less than 0.02 | wt% | MnO |
| COMPOSITION: | MgO | 33.9 | wt% | MgO |
| COMPOSITION: | CaO | 0.09 | wt% | CaO |
| COMPOSITION: | Na2O | less than 0.15 | wt% | Na2O |
| COMPOSITION: | K2O | 0.07 | wt% | K2O |
| COMPOSITION: | P2O5 | less than 0.05 | wt% | P2O5 |
| COMPOSITION: | Total | wt% | ||
| COMPOSITION: | O=Cl,F,S | wt% | #correction for Cl, F, S | |
| COMPOSITION: | New Total | wt% |
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
XRF analysis by Joe Taggart and A. Bartel of the USGS
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Basal cleavage, pale green color, scaly aggregates, first order gray interference color, low relief, all consistent with chlorite. Trace magnetite and epidote(?). G. Swayze.
plates 35 µm thick and 500 µm in diameter.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2b3b4b # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns