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Holtite, (Si2.25Sb0.75)B [Al6(Al0.43Ta0.27□0.30) O15 (O,OH)2.25]: crystal structure and crystal chemistry

Published online by Cambridge University Press:  05 July 2018

B. F. Hoskins ,
W. G. Mumme  and
M. W. Pryce
B. F. Hoskins
Affiliation:
University of Melbourne, Parkville, Melbourne, Australia
W. G. Mumme
Affiliation:
CSIRO, Division of Mineral Products, P.O. Box 124, Port Melbourne, Australia
M. W. Pryce
Affiliation:
Government Chemical Laboratories, Perth, Western Australia
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Abstract

Holtite, (Si2.25Sb0.75)B[Al6(Al0.43Ta0.27□0.30)O15(O,OH)2.25], is orthorhombic a = 4.6914(5), b = 11.896(2), c = 20.383(4)Å, space group Pnma. Full-matrix least-squares refinement yielded a final R = 0.030, for 1664 reflections with I ⩾ 3σ(I). Its crystal structure is closely related to that of dumortierite, but with the difference that extensive substitution of Si by Sb occurs in holtite. SbO3 triangular pyramids replace the SiO4 tetrahedra arranged around the inside edge of the hexagonally shaped tunnels which are the feature of the dumortierite and holtite structures. Associated with these replacements is the replacement of Al by Ta in the octahedral site centred in these tunnels, and the development of vacancies in this metal site and its attached oxygens.

Keywords

holtitecrystal structurecrystal chemistryGreenbushesAustralia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 53 , Issue 372 , September 1989 , pp. 457 - 463
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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