Orthoclase (K- feldspar) Supercell

3D Model

Structure of the mineral orthoclase. Shows a 2 x 2 x 2 supercell, with K in purple, Al in silver, Si in ochre, and O in red. Approximate distribution of Al and Si is shown. The network structure of feldspar can be seen. (Most orthoclase starts as a solid solution with albite or Na-plagioclase, where Na+ replaces K+ in some sites.)