Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 18, Issue -, Pages 189-197Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0909049510045322
Keywords
XANES; phosphorus; phosphate minerals
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Funding
- National Science Foundation [0849494]
- US-Israel Binational Science Foundation [2008216]
- US Department of Energy
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0849494] Funding Source: National Science Foundation
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Phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy was performed on phosphate mineral specimens including (a) twelve specimens from the apatite group covering a range of compositional variation and crystallinity; (b) six non-apatite calcium-rich phosphate minerals; (c) 15 aluminium-rich phosphate minerals; (d) ten phosphate minerals rich in either reduced iron or manganese; (e) four phosphate minerals rich in either oxidized iron or manganese; (f) eight phosphate minerals rich in either magnesium, copper, lead, zinc or rare-earth elements; and (g) four uranium phosphate minerals. The identity of all minerals examined in this study was independently confirmed using X-ray powder diffraction. Minerals were distinguished using XANES spectra with a combination of pre-edge features, edge position, peak shapes and post-edge features. Shared spectral features were observed in minerals with compositions dominated by the same specific cation. Analyses of apatite-group minerals indicate that XANES spectral patterns are not strongly affected by variations in composition and crystallinity typical of natural mineral specimens.
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