Definitions for "Mullite"
A dynamic crystal that grows in the clay body at high temperatures. It adds strength and resiliance. Mullite crystals are made from aluminum silicate.
an aggregate for refractories in investment casting with good hot strength and unique thermal expansion properties
Interlocking needlelike crystals of aluminum silicate (3Al O 2SiO ) which form in high-temperature bodies between 1850 -2200 F. This formation is responsible for much of the greater toughness and hardness of stoneware and porcelain, and in particular for the closer union developed between the glaze and the body.