RGB-3932.5, Sandstone sample from unknown formation

Panchromatic grayscale CL image. A close-up showing Category II (compactional) microfractures in the sample. These fractures are lined with quartz. The wedge-shaped and curved traces are typical of Category II microfractures and suggest a rotational component to fracturing.

Note the complex zoning in the quartz overgrowth above the large curved microfracture in the right center.