SYMMETRY REDUCTION OF THE ALUMINOSILICATE FRAMEWORK OF LAU TOPOLOGY BY ORDERING OF EXCHANGEABLE CATIONS: THE CRYSTAL STRUCTURE OF PRIMARY LEONHARDITE WITH A PRIMITIVE BRAVAIS LATTICE
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Baur W.H. | |
dc.contributor.author | Joswig W. | |
dc.contributor.author | Fursenko B.A. | |
dc.contributor.author | Belitsky I.A. | |
dc.date.accessioned | 2020-12-23T08:23:18Z | |
dc.date.available | 2020-12-23T08:23:18Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=13254430 | |
dc.identifier.citation | European Journal of Mineralogy, 1997, , 6, 1173-1182 | |
dc.identifier.issn | 0935-1221 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21124 | |
dc.description.abstract | Primary leonhardite, Ca2.55K1.59Na1.24Fe0.03Al 8.19Si15.87O48 · 13.93H2O, with a primitive Bravais lattice, is a leonhardite that cannot be hydrated and is not formed by the dehydration of laumontite. It crystallizes in space group P 12/a1 with a = 14.556(4) Å, b = 13.206(3) Å, c = 7.513(3) Å, β = 110.75(2)°, V = 1351(1) Å3 and Z = 1. Even though P 12/a1 is a subgroup of C 12/m1 (the space group of laumontite and secondary leonhardite), the geometry of the aluminosilicate framework and the distribution of Al and Si atoms in primary leonhardite are extremely close to what is known for laumontite (Ca4Al8Si16O48 · 18H2O) and partly dehydrated laumontite (Ca4Al8Si16O48 · 14H2O). Because Na and K substitute for Ca in the pores of primary leonhardite in an ordered way, its symmetry is reduced compared with laumontite. Because the total number of pore-filling cations is larger than in any other known laumontite (due to the replacement of Ca by univalent cations) primary leonhardite cannot accomodate as many water molecules in its pores as laumontites. | |
dc.title | SYMMETRY REDUCTION OF THE ALUMINOSILICATE FRAMEWORK OF LAU TOPOLOGY BY ORDERING OF EXCHANGEABLE CATIONS: THE CRYSTAL STRUCTURE OF PRIMARY LEONHARDITE WITH A PRIMITIVE BRAVAIS LATTICE | |
dc.type | Статья |
Files in this item
Files | Size | Format | View |
---|---|---|---|
There are no files associated with this item. |
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru