4" wide x 3" high
Very translucent porcelain got a big blob of soupy Earth crust slurry poured into the center. Some gassy event got frozen into the cooled bowl -- blistered and split showing tension between the refined porcelain particles and the unrefined rock slurry. Same slurry applied thinly on the exterior of the bowl fired smoothly.
Band of asteroid-laden sediment is on the inside and outside -- in a narrow band underwhich words are written.