Figure F4. Sedimentary rock fragments: clay-rich mudstones. A, B. Grain has fractures filled with microcrystalline quartz (chert). C, D. Near-opaque grain has fracture filled with chlorite. Grain in lower right has a chert-filled fracture. E, F. Clay-rich mudstone grain containing a sand-size quartz clast. Left = plane-polarized light, right = cross-polarized light.
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