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DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: WS532
MINERAL_TYPE: Sorosilicate
MINERAL: Allanite
FORMULA: (Ce,Ca,Y,La)2(Al,Fe2+,Fe3+)3(SiO4)3(OH)
FORMULA_HTML: (Ce,Ca,Y,La)2(Al,Fe2+,Fe3+)3(SiO4)3(OH)
COLLECTION_LOCALITY: Besner Mine, Henvey, Ontario, Canada
ORIGINAL_DONOR: Ward Scientific
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION: Large black massive sample with vitrious luster, conchoidal fractures, and thin white veins.
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Anaylsis indicates a poorly crystalline allanite; sharp, symmetrical peaks are absent; the allanite phase is represented by broad, rounded reflections which are consistent with allanite in a metamict state. (R. Driscoll)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EPMA, ICP(Trace), WChem
COMPOSITION_TRACE:
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The spectrum of this sample was measured on the black phase. The spectrum has a monotonic increase toward longer wavelengths. There is a broad electronic transition absorption centered at 0.916 microns and two narrower absorptions at 1.086 and 1.322 microns. There are no obvious f-f orbital electronic transition absorptions from lanthanide series rare earth elements presumably because they are swamped by the more intense Fe-related charge transfer absorption(s). (G. Swayze)
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns