Definition of mullite in English:

mullite

noun

Mineralogy
  • An orthorhombic silicate of aluminium, Al₆Si₂O₁₃, that is formed by the action of high temperatures on other aluminium silicates and is used for making refractory porcelains and bricks.

Origin

1920s. From Mull, the name of an island off the west coast of Scotland where the silicate was first identified + -ite.

Pronunciation

mullite

/ˈmʌlʌɪt/