Steven Dutch, Professor Emeritus, Natural and Applied Sciences,
Leucite is a feldspathoid, with a composition like potassium feldspar (KAlSi2O6) but with less silica. It has an almost perfectly cubic unit cell, but is actually tetragonal. The nearly cubic unit cell allows leucite to crystallize in pseudo-isometric crystal forms. Aluminum occupies one third of the tetrahedra.
Above, a view down the c-axis, showing the fourfold screw axes.
Above, a view normal to the c-axis.
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Created 22 April 2013, Last Update