Synchrotron X-Ray microtomography 3D image (a) and cathodoluminescence slice (b)

Synchrotron X-Ray microtomography 3D image (a) and cathodoluminescence slice (b) from the same reentrant-bearing quartz crystal from the Lava Creek Tuff. The reentrants are in darker blue in (a) and the black cavities in (b). Note their relationship to quartz growth bands. Red domains are small magnetite crystals. The plane of the cathodoluminescence slice is shown by the gray plane in (a).