Thin Section of Fault Breccia

Photograph of thin section of fault breccia from the Blue Ridge province, Virginia. Note the angular fragments (fr) of quartz sandstone in a matrix of fine-grained iron oxide cement (ic). Field of view is 4 mm x 2.7 mm, with cross polarized light. Image from website: http://www.wm.edu/geology/virginia/ fault_zone_lithology.html