Startseite Crystal chemical models for the cancrinite-sodalite supergroup: the structure of a new 18-layer phase
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Crystal chemical models for the cancrinite-sodalite supergroup: the structure of a new 18-layer phase

  • Elena Bonaccorsi EMAIL logo und Sabrina Nazzareni
Veröffentlicht/Copyright: 14. April 2015
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Zeitschrift für Kristallographie - Crystalline Materials
Aus der Zeitschrift Zeitschrift für Kristallographie - Crystalline Materials Band 230 Heft 5

Abstract

The framework of the minerals belonging to the cancrinite-sodalite supergroup is very flexible and adapts itself to a wide range contents of extra-framework anions, giving rise to complex structures with different stacking sequences of layers that contain six-membered rings of tetrahedra. The knowledge of the crystal chemistry of these minerals was the key for the structure solution of a new phase showing a sequence with 18 layers. Geometrical and chemical constraints were imposed to the positions of the six-member rings so limiting the number of possible non-equivalent sequences of the 18 layers. The more probable sequences were single out on the basis of the chemical data and used as starting model vs. single crystal X-ray intensity data. The new 18-layer phase, ideal chemical formula (Na, K, Ca)72(Si54Al54O216)(SO4)16(Cl, H2O)8, Z = 1, space group P3, a = 12.904(2) Å, c = 47.802(4) Å, displays a stacking sequence ABCABACACABABACABC, Zdhanov symbol (8)211(2)112. The examined crystal was found in the sample MMUR (Museo di Mineralogia dell’Università di Roma “La Sapienza”) 24320, associated with sacrofanite, which is the 28-layer member of the supergroup. The sample was collected at Sacrofano, (Latium, Italy) in a volcanic ejected block, which originated from a pneumatolitic-pyroclastic explosion.

Keywords: cancrinite-sodalite; crystal structure; X-ray diffraction
Corresponding author: Elena Bonaccorsi, Dipartimento di Scienze della Terra, University of Pisa, Pisa, Italy, e-mail:

Acknowledgments

We are grateful to Prof. Ballirano, University La Sapienza of Rome (Italy) who gave us the samples containing the new phase and to Prof. Stefano Merlino for the critical reading of the manuscript.

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Supplemental Material

The online version of this article (DOI: 10.1515/zkri-2014-1819) offers supplementary material, available to authorized users.

Received: 2014-11-11
Accepted: 2015-2-24
Published Online: 2015-4-14
Published in Print: 2015-5-1

©2015 by De Gruyter

Artikel in diesem Heft

  1. Frontmatter
  2. Graphical Synopsis
  3. Preface
  4. Special Issue: Zeolites
  5. Original Articles
  6. The importance of T⋯T⋯T angles in the feasibility of zeolites
  7. On the relationship between unit cells and channel systems in high silica zeolites with the “butterfly” projection
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  9. Structure and bonding of water molecules in zeolite hosts: Benchmarking plane-wave DFT against crystal structure data
  10. A microporous potassium vanadyl phosphate analogue of mahnertite: hydrothermal synthesis and crystal structure
  11. Crystal chemical models for the cancrinite-sodalite supergroup: the structure of a new 18-layer phase
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  13. Structures of dehydrated microporous copper silicate CuSH-6Na, an in situ single crystal X-ray study
https://doi.org/10.1515/zkri-2014-1819
Schlagwörter für diesen Artikel
cancrinite-sodalite; crystal structure; X-ray diffraction

Artikel in diesem Heft

  1. Frontmatter
  2. Graphical Synopsis
  3. Preface
  4. Special Issue: Zeolites
  5. Original Articles
  6. The importance of T⋯T⋯T angles in the feasibility of zeolites
  7. On the relationship between unit cells and channel systems in high silica zeolites with the “butterfly” projection
  8. A DFT-D study of the interaction of methane, carbon monoxide, and nitrogen with cation-exchanged SAPO-34
  9. Structure and bonding of water molecules in zeolite hosts: Benchmarking plane-wave DFT against crystal structure data
  10. A microporous potassium vanadyl phosphate analogue of mahnertite: hydrothermal synthesis and crystal structure
  11. Crystal chemical models for the cancrinite-sodalite supergroup: the structure of a new 18-layer phase
  12. Synthesis and structure of new microporous Nd(III) silicates of the rhodesite group
  13. Structures of dehydrated microporous copper silicate CuSH-6Na, an in situ single crystal X-ray study
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