And using clay? This seems very sentimental. Are there not more long-lasting mediums? Especially with laser printing where we can quickly engrave knowledge without the risk of human error or time-consuming manual labor.
Ceramic is very stable during time. All modern media that you might think (LP? tapes? Optical disks?) require some special instrument to recover the information, other than simply looking at it (perhaps using some microscope).
Paper degrades. Plastic degrades, in general. Metals rust. But stones and ceramics tend to be very durable, including against microorganisms and chemicals. They just don't withstand mechanical forces, like a hammer. But anyone willing to use a hammer would use any other thing to destroy other medias, too.
There are many better kinds of ceramic available, even glass would be a better choice.