Pellyite Structure

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay

Barium silicates definitely like the funky. There's benitoite, with its three-membered rings, and Pellyite Ba2Ca(Fe++,Mg)2Si6O17 with its linked rings. Silica tetrahedra are purple, barium is green, calcium is yellow and iron and magnesium are orange. The large ionic radius of barium perhaps accounts for the unusual structures.

Above is a view of the chains face-on.

The view above shows the chains end-on.

Above is a face-on view showing the other cation coordination polyhedra.

Above is an end-on view showing the other cation coordination polyhedra.

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Created 22 April 2013, Last Update