Metakaolin

Metakaolin is a dehydroxylated form of the clay mineral kaolinite.

Rocks that are rich in kaolinite are known as china clay or kaolin, traditionally used in the manufacture of porcelain. The particle size of metakaolin is smaller than cement particles, but not as fine as silica fume.

Read more about Metakaolin:  Kaolinite Sources, Forming Metakaolin, High-reactivity Metakaolin, Concrete Application, Advantages, Uses