In the manga and anime, there are many references to the use of "ceramic" as a material. We know that the vanished industrial civilization which preceded the rise of the toxic jungle used it widely, and it was important enough that this time was known as the Ceramic Era. In the time of Nausicaa many human settlements support themselves by mining it. So it must require a high level of technological sophistication to produce, and also be capable of being reworked.
It is hard enough to be used for armour and bladed weapons:
And light enough for the fuselage of aircraft, as we can infer here:
Although it is brittle, and therefore inferior in resilience to Ohmu shell.
It seems quite unlike the material today used to make bricks, dinner plates and electrical insulators. Do we have any information on the nature of ceramics in Nausicaa's world? Do comparable ceramic materials exist today?