From structure topology to chemical composition. XXV: new insights into the close packing of cations in the structures of the seidozerite-supergroup TS-block minerals

From structure topology to chemical composition. XXV: new insights into the close packing of... AbstractThe titanium-silicate (TS) block is the main structural unit in the 45 seidozerite-supergroup minerals; it consists of a central O (O=Octahedral) sheet and two adjacent H (H=Heteropolyhedral) sheets where Si2O7 groups occur in the H sheets. The three HOH sheets of the TS block form a three-layered close packing of cations with an ABC repeat; mean cation–cation distances are 3.41 Å. Minerals of the seidozerite supergroup are divided into four groups based on the content of Ti and topology and stereochemistry of the TS block: in rinkite, bafertisite, lamprophyllite and murmanite groups, Ti (+Nb+Zr+Fe3++Mg+Mn)=1, 2, 3 and 4 apfu, respectively. All TS-block structures consist either solely of TS blocks or of two types of block: the TS block and an I (intermediate) block that comprises atoms between two TS blocks. The TS block propagates close packing of cations into the I block. There are two types of close-packed layers of cations in the I block: (I) a layer of Na+ and P5+ with mean cation–cation distances of 3.41 Å and (II) a layer of Ba2+ (+K+, Sr2+ and Na+) with mean cation–cation distances of 4.73 Å. The general topology of the TS block is independent of the topology and chemical composition of the I block. However direct interaction between TS and I blocks takes place in the crystal structures of jinshajiangite, bobshannonite, bafertisite, hejtmanite, delindeite and cámaraite. Interaction of Ba atoms in the I block and F (+O) atoms of the TS block results in doubling of the minimal translations, 2t1 and 2t2, and a concomitant change in symmetry of the structure from primitive to C-centered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Zeitschrift für Kristallographie - Crystalline Materials de Gruyter

From structure topology to chemical composition. XXV: new insights into the close packing of cations in the structures of the seidozerite-supergroup TS-block minerals

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Publisher
De Gruyter
Copyright
©2018 Walter de Gruyter GmbH, Berlin/Boston
ISSN
2196-7105
eISSN
2196-7105
D.O.I.
10.1515/zkri-2017-2115
Publisher site
See Article on Publisher Site

Abstract

AbstractThe titanium-silicate (TS) block is the main structural unit in the 45 seidozerite-supergroup minerals; it consists of a central O (O=Octahedral) sheet and two adjacent H (H=Heteropolyhedral) sheets where Si2O7 groups occur in the H sheets. The three HOH sheets of the TS block form a three-layered close packing of cations with an ABC repeat; mean cation–cation distances are 3.41 Å. Minerals of the seidozerite supergroup are divided into four groups based on the content of Ti and topology and stereochemistry of the TS block: in rinkite, bafertisite, lamprophyllite and murmanite groups, Ti (+Nb+Zr+Fe3++Mg+Mn)=1, 2, 3 and 4 apfu, respectively. All TS-block structures consist either solely of TS blocks or of two types of block: the TS block and an I (intermediate) block that comprises atoms between two TS blocks. The TS block propagates close packing of cations into the I block. There are two types of close-packed layers of cations in the I block: (I) a layer of Na+ and P5+ with mean cation–cation distances of 3.41 Å and (II) a layer of Ba2+ (+K+, Sr2+ and Na+) with mean cation–cation distances of 4.73 Å. The general topology of the TS block is independent of the topology and chemical composition of the I block. However direct interaction between TS and I blocks takes place in the crystal structures of jinshajiangite, bobshannonite, bafertisite, hejtmanite, delindeite and cámaraite. Interaction of Ba atoms in the I block and F (+O) atoms of the TS block results in doubling of the minimal translations, 2t1 and 2t2, and a concomitant change in symmetry of the structure from primitive to C-centered.

Journal

Zeitschrift für Kristallographie - Crystalline Materialsde Gruyter

Published: Mar 28, 2018

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