Abstract
If AlO 6-octahedra were accidentally included in growing feldspar structures as point defects, they could become ordered on hypothetical (010) 2/4±1/4 crystallographic shear planes and/or collapsed twin boundaries. Such planar defects would consist of ordered arrays of tetrahedral and octahedral sites, and six-coordinated interstitial positions. It is tentatively suggested that Al in excess of the ideal feldspar composition could be accomodated metastably in such planar defects.
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