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A new superstructure was found in mordenite (Na 5.59 Ca 1.80 Al 9.19 Si 38.81 O 96 ·nH 2 O) from Challis Valley, Idaho-a zeolite widely used in previous studies. The occurrence of the superstructure reflections were observed in 12 specimens from two rock samples, at the midpoint of layers in the oscillation photographs around the a* and b* axes, but not around the c* axis. The apparent 2a, 2b, and c axes are orthogonal. In spite of yielding an apparent orthorhombic cell, careful observation of the intensities revealed that the superstructure is monoclinic with twice the volume of the orthorhombic cell: a’ = 27.356(9), b’ = 27.356(9), c’ = 7.517(2) Å, γ′ = 97.14(4)°, and V′ = 5582(4) Å 3 .

Superstructure of Challis mordenite with doubled monoclinic unit cell