A multi-domain gem-grade Brazilian apatite

Simple item page
dc.contributor.authorBaikie, Ten_AU
dc.contributor.authorSchreyer, MKen_AU
dc.contributor.authorWong, CLen_AU
dc.contributor.authorPramana, SSen_AU
dc.contributor.authorKlooster, WTen_AU
dc.contributor.authorFerraris, Cen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorWhite, TJen_AU
dc.date.accessioned2014-04-04T02:44:23Zen_AU
dc.date.available2014-04-04T02:44:23Zen_AU
dc.date.issued2012-10-01en_AU
dc.date.statistics2014-04-04en_AU
dc.description.abstractA gem-grade apatite from Brazil of general composition (Ca,Na)10[(P,Si,S)O4]6(F,Cl,OH)2 has been studied using single-crystal X-ray and neutron diffraction together with synchrotron powder X-ray diffraction. Earlier electron microscopy studies had shown the nominally single-phase apatite contains an abundant fluorapatite (F-Ap) host, together with chloro-hydroxylapatites (Cl/OH-Ap) guest phases that encapsulate hydroxylellestadite (OH-El) nanocrystals. While the latter features appear as small (200–400 nm) chemically distinct regions by transmission electron microscopy, and can be identified as separate phases by synchrotron powder X-ray diffraction, these could not be detected by single-crystal X-ray and neutron analysis. The observations using neutron, X-ray and electron probes are however consistent and complementary. After refinement in the space group P63/m the tunnel anions F− are fixed at z = ¼ along <001>, while the anions Cl− and OH− are disordered, with the suggestion that O-H•••O-H••• hydrogen-bonded chains form in localized regions, such that no net poling results. The major cations are located in the 4f AFO6 metaprism (Ca+Na), 6h ATO6X tunnel site (Ca only), and 6h BO4 tetrahedron (P+Si+S). The structural intricacy of this gem stone provides further evidence that apatite microstructures display a nano-phase separation that is generally unrecognized, with the implication that such complexity may impact upon the functionality of technological analogues. © 2012, Mineralogical Society of America.en_AU
dc.identifier.citationBaikie, T., Schreyer, M. K., Wong, C. L., Pramana, S. S., Klooster, W. T., Ferraris, C., McIntyre, G. J., & White, T. J. (2012). A multi-domain gem-grade Brazilian apatite. American Mineralogist, 97(10), 1574-1581. doi:10.2138/am.2012.4069en_AU
dc.identifier.govdoc4588en_AU
dc.identifier.issn0003-004Xen_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleAmerican Mineralogisten_AU
dc.identifier.pagination1574-1581en_AU
dc.identifier.urihttp://dx.doi.org/10.2138/am.2012.4069en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5402en_AU
dc.identifier.volume97en_AU
dc.language.isoenen_AU
dc.publisherDe Gruyteren_AU
dc.subjectBrazilen_AU
dc.subjectApatitesen_AU
dc.subjectSynchrotronsen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectCalciumen_AU
dc.titleA multi-domain gem-grade Brazilian apatiteen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles