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Some aspects of the crystal-chemistry of apatites

Published online by Cambridge University Press:  05 July 2018

Yu Liu  and
Paola Comodi
Yu Liu
Affiliation:
Wuhan Institute of Chemical Technology, 430074-Hubei, P.R. China
Paola Comodi
Affiliation:
Dipartimento di Scienze della Terra, Università di Perugia, 06100-Perugia, Italia
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Abstract

Twenty-four apatite (Ap) samples mainly from carbonatite and alkaline rocks were studied by electron microprobe, IR spectroscopy and X-ray powder diffraction. The crystal structures of six were refined using single crystal X-ray diffraction data to R = 1.7-2.5%. The generally high Si content of Ap from carbonatite and alkaline rock has been related to the presence of characteristic Si-O absorptions in IR spectra. Bands, whose intensities change with Si content, were observed at 520, 650, 930 and 1160 cm-1. The IR absorption features of v3 CO3 mode of Ap from carbonatite are different from those of v3 CO3 mode of Ap from sedimentary rock. This phenomenon is probably due to the different effects of F and OH on the CO3 substitution for PO4. The structural refinements yield more information on the CO3=PO4 substitution, which is now supported also by the geometrical evolution of the tetrahedron with increasing CO3 content: the tetrahedral size decreases and the angle distortion increases with C-content. It is likely that the triangular planar CO3 group is disordered on the four faces of PO43-tetrahedron. It was observed also that Ap from early-stage carbonatite is OH-dominant with considerable LREE, Si, CO3 and negligible Mn, Fe, Mg, K, S and C1 contents. They have high Sr/Mn, Si/S and C/S ratios.

Keywords

apatitecarbonatitealkaline rockscrystal-chemistrycarbonate
Type
Mineralogy
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 709 - 719
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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