The sample for NanoCT measurements was prepared by fracturing off a small fragment (~200 m long ~50 m thick needle-like fragment) from the center of the l=0.989 mm ceramic using a razor blade. The fragment was then mounted to the head of a pin using a UV curing adhesive (Bondic®). X-ray 3D tomographic imaging was performed using a Zeiss Xradia Ultra 810 NanoCT microscope, operating firstly in the large field of view mode (65 µm field of view, starting with absorption contrast and then with Zernike phase contrast) followed by the high resolution mode (16 µm field of view, pixel resolution of 16nm with nominal spatial resolution of 50nm, absorption contrast only). Quasi-monochromatic X-rays were generated using a chromium source (~5.4 keV;~2.3 Å) and X-rays were detected with a high contrast scintillator-based detector and a corresponding optically coupled CCD detector. The high resolution experiment utilized an exposure time of 300s with binning 1 and 901 projections total. Forty total images were gathered before and after the tomography and averaged together to make a reference image. Zeiss XMReconstructor was used to build the tomography data into a 3D volume.