Kilchoanite Structure

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
First-time Visitors: Please visit Site Map and Disclaimer. Use "Back" to return here.

Kilchoanite Ca3Si2O7 is a polymorph of rankinite, which is a true sorosilicate. Kilchoanite, on the other hand, has three-tetrahedra units and solitary tetrahedra.

The structure turns out to be pretty simple. Above is a view looking face on at the silica units. Calcium atoms are yellow. All the atoms in the structure line up directly behind one another.

Above, a slightly oblique view showing how everything lines up neatly. Darker colors are closer to the plane of the diagram.

Above, an end-on view. Trimers (triple units) are purple and single tetrahedra are blue. Darker colors are closer to the plane of the diagram.

This is a nice illustration of a mineral where coordination polyhedra don't help. Above is a face-on view with silica tetrahedra in violet and calcium polyhedra in other colors.

Return to Thin-Section Index
Return to Crystal Structures Index
Return to Mineral Identification Tables
Return to Professor Dutch's Home Page

Created 22 April 2013, Last Update 08 Jul 2013

Not an official UW Green Bay site