Kaolinite is a magma-safe dark red stone, much like bauxite. It can be fired at a kiln to produce porcelain goods.
In the real world, Kaolinite is one of the most common minerals. Being a clay mineral, Kaolinite clay occurs in abundance in soils that have formed from the chemical weathering of rocks in hot, moist climates—for example in tropical rainforest areas. While it is largely used in the production of paper, cosmetics, and soaps; it can also be used in farming in the form of a spray as to deter insect damage.