Sodalite

Class: Zeolite

Related Structures: Linde Type A, Faujasite, Lazurite

 

The sodalite structure type. Orange spheres occupy the pore space.
The sodalite structure type. Orange spheres occupy the pore space.
Sodalite - SOD
Sodalite – SOD (T-sites only)

Description:

The sodalite zeolite is the closest packing of the sodalite cage, which in turn is truncated octahedron also known as the Kelvin cell. The aluminosilicate is naturally occurring with a wide range of compositions and synthetic derivatives have been targeted for a wide range of applications and phenomena. While essentially nonporous the material is will suited for the encapsulation and matrix isolation of reactive molecules. This includes the naturally occurring mineral lazurite where a S3 radical anion is trapped within the sodalite cage. This is an interesting case considering that S3 is unknown as a free radical or otherwise stable in any coordination complex though some have been predicted.

Lazurite. White spheres are sodium cations and a trisulfide radical anion sits in the center of the sodalite cage.
Lazurite. White spheres are sodium cations and a trisulfide radical anion sits in the center of the sodalite cage.

Topology: SOD

Formula: Na8(Al6Si6O24)Cl2

Space Group: F-43n

Unit Cell: 8.876 Å; Z = 1

Pore Structure: Face sharing cages in 3-dimensions

Pore Dimensions: 6.31 Å (cage diameter); 2.53 Å (window diameter)

Occurrence: Natural and synthetic

Common Phases: Na8(Al6Si6O24)Cl2 (sodalite), Na4AlBeSi4O12Cl (tugtupite), Na8(Al6Si6O24)Cl2 (hackmanite)

Applications: Advanced optical and semiconductor materials (not commercially realized)

Database of Zeolite Structures: (link)

Wikipedia: (link)

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