The structure contains pairs of mica-like layers linked by 0.7 (K, Ca) ions/unit cell. These pairs of layers are separated by 0, 1, 2 or 3 layers of water molecules each containing 2 molecules/unit cell. One-dimensional fourier syntheses of electron density reveal the number and position of the interlayer cations and water molecules. Comparison with vermiculite shows significant differences. At high temperatures, around 900° C., the loss of (OH) groups without disruption of the layer structure is demonstrated. Organic complexes of allevardite are compared with those of montmorillonite. A fourier synthesis of the ethylene glycol complex suggests the orientation of the organic molecules between the silicate layers.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.