A multi-domain gem-grade Brazilian apatite
A 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...[Show more]
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