Kyanite has properties that make it exceptionally well suited for the manufacture of a high-refractory-strength porcelain – a porcelain that holds its strength at very high temperatures. A familiar use of this type of porcelain is the white porcelain insulator on a spark plug.

Kyanite is also used in some of the more common forms of porcelain, such as those used to make dentures, sinks, and bathroom fixtures.