RGB-3932.5, Sandstone sample from unknown formation

Color CL and SEI views of the same area. An ankerite-filled microfracture cuts diagonally across this sample from RGB3932.5, it is not necessary to use the CL to see it. However, there are a couple of smaller microfractures parallel to the larger one that are quartz-lined and are not visible in SEI mode. There are also a number of other quartz-lined fractures that are not parallel to the main fracture.