As crystallizes in the tetragonal I4/mmm space group. There are two inequivalent As sites. In the first As site, As(1) is bonded to four equivalent As(1) and four equivalent As(2) atoms to form a mixture of distorted edge, corner, and face-sharing AsAs8 hexagonal bipyramids. In the second As site, As(2) is bonded to eight equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing AsAs8 hexagonal bipyramids.
As crystallizes in the tetragonal I4/mmm space group. There are two inequivalent As sites. In the first As site, As(1) is bonded to four equivalent As(1) and four equivalent As(2) atoms to form a mixture of distorted edge, corner, and face-sharing AsAs8 hexagonal bipyramids. All As(1)-As(1) bond lengths are 2.88 Å. All As(1)-As(2) bond lengths are 2.88 Å. In the second As site, As(2) is bonded to eight equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing AsAs8 hexagonal bipyramids.