Kaolin Clay
Deep dive documentation for Advanced Mechanics systems.
Kaolin Clay is required to make Fire Clay. It can be found spawning between Y=75-110 in Plateaus, Old Mountains, Rolling Hills, and Highlands, at a temperature of at least 18°C, with a rainfall of at least 300mm. The Blood Lily flower grows on Kaolin clay, which can be up to 35 blocks below.
Generally, go South East to increase temperature and humidity.
Kaolinite Powder
Only 20% of Kaolin Clay will turn into Kaolinite Powder, so it's recommended to bake it on-site using Pit Kilns to save inventory space.
Bring home around 20 Blocks of Kaolin Clay as well, for Glassworking later.