The note describes (100) stacking faults in kyanite from a staurolite–kyanite intergrowth with a displacement vector R = ½b. Diffraction spots k ≠ 2n are streaked and only with those reflections stacking faults are in contrast, which is interpreted as due to a displacement of ½b on the (100) faults. This produces groups of two corner-sharing tetrahedra. If stacking faults occur periodically superstructures develop with a doubled or threefold a axis. These faults are frequently combined with lamellar microtwins adjacent to the kyanite–staurolite interface.

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