Shear faults in Lovelock ferrierite: An X-ray and electron diffraction analysis

Pervasive streaking observed in electron diffraction patterns indicates that natural ferrierite from Lovelock, Nevada, frequently contains planar defects. Modeling and diffraction simulations of seven candidate fault structures indicate that the most commonly observed fault involves c 2a shear on the (040) planes and can occur with a frequency of up to 30% on the (040) planes in an individual crystallite. Also observed are faults involving a c 2 shear on the (400) planes, which occur with a lower frequency of ∼ 5%.