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Title: | First terrestrial occurrence of the complex phosphate chladniite: crystal-structure refinement by synchrotron through-the-substrate microdiffraction |
Authors: | Vallcorba, Oriol ![]() ![]() ![]() |
Keywords: | tts-μXRD Chladniite Complex phosphates Fillowite group Polished thin section Synchrotron radiation Meteorites Pegmatites Thin glass substrates Crystal structure refinement |
Issue Date: | May-2017 |
Publisher: | Schweizerbart science publishers |
Citation: | European Journal of Mineralogy 29 (2): 287-293 (2017) |
Abstract: | Chladniite, a complex phosphate species belonging to the fillowite group so far only found in meteorites, was identified in a pegmatite from Córdoba (Argentina) as inclusions in beusite. Applying synchrotron through-the-substrate microdiffraction technique (tts-μXRD) to polished thin sections prepared on very thin glass substrates (0.1 mm), diffraction data with nearly single-crystal quality were directly measured at selected chladniite microvolumes of the section. Chladniite is trigonal (space group R-3), with a = 15.0133(3) Å, c = 42.887(2) Å, V = 8371.6(5) Å3. The subsequent crystal structure refinement confirms that the accuracy attainable by using 0.1 mm thick glass-substrates is comparable to that of routine single-crystal measurements [R1=3.34% for 1617 unique reflections]. The refined crystal structure of pegmatitic chladniite differs from meteoritic one in the cation ordering (Mg, Fe+Mn and Ca) at the various metal sites, with Mn being dominant at the M(1) position. |
Publisher version (URL): | http://dx.doi.org/10.1127/ejm/2017/0029-2590 |
URI: | http://hdl.handle.net/10261/155837 |
DOI: | 10.1127/ejm/2017/0029-2590 |
ISSN: | 0935-1221 |
E-ISSN: | 1617-4011 |
Appears in Collections: | (ICMAB) Artículos |
Files in This Item:
File | Description | Size | Format | |
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Vallcorba_EurJMiner_2017.pdf | Artículo principal | 561,6 kB | Adobe PDF | ![]() View/Open |
Vallcorba_EurJMiner_2017_suppl.pdf | Información complementaria | 369,47 kB | Adobe PDF | ![]() View/Open |
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