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Ba-rich celestine: new data and crystal structure refinement

Published online by Cambridge University Press:  05 July 2018

M. F. Brigatti ,
E. Galli  and
L. Medici
M. F. Brigatti
Affiliation:
Dipartimento di Scienze della Terra, Università di Modena, Largo S. Eufemia 19, 1-41100, Modena, Italy
E. Galli
Affiliation:
Dipartimento di Scienze della Terra, Università di Modena, Largo S. Eufemia 19, 1-41100, Modena, Italy
L. Medici
Affiliation:
Dipartimento di Scienze della Terra, Università di Modena, Largo S. Eufemia 19, 1-41100, Modena, Italy
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Abstract

A Ba-rich celestine (Sr0.87Ba0.13SO4) filling cavities of volcanoclastic rocks from Montecchio Maggiore (Vicenza, Italy) was studied. The role of the Ba content in the mineral was determined using X-ray powder data, single crystal X-ray refinement, thermal and chemical analyses. The unit cell parameters (obtained by single crystal diffraction) are a = 8.408, b = 5.372, c = 6.897 Å, and the refinement in the space group Pnma (Z = 4) gives the final R value of 0.039. The average (Sr,Ba)-oxygen bond length is 2.842 Å and agrees with an occupancy of Sr 87% and Ba 13%. Individual bond lengths (Sr,Ba)-O and bond strength calculations confirm that all twelve interactions are significant and define an irregular array around the cation.

Keywords

celestinebariumcrystal structure refinementVicenzaItaly
Type
Crystal Structure
Information
Mineralogical Magazine , Volume 61 , Issue 406 , June 1997 , pp. 447 - 451
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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