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Written by: Jim Beard
Wednesday January 28, 2015

Rotated Crystal in Fault Zone

This crystal of the mineral hornblende is within a zone of movement called a fault. During faulting, rock on one side of the fault moves with respect to rock on the other side of the fault. Once in a while, a crystal gets trapped in the movement zone and rotates. In this case, we can tell from the rotation that rock at the top part of the slide moved to the left with respect to the rock at the bottom.

January 2015 Microphoto of the Month

Tags: Dr. Jim Beard, Earth Science, Geology, Microphoto of the Month, Research and Collections