pearlite

A mixture of ferrite and cementite forming distinct layers or bands in slowly cooled carbon steels.

The eutectoid of Steel.

A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under perlitic.

A two-phased lamellar structure composed of alternating layers of alpha ferrite and cementite that occurs in some steels and cast irons, having a pearlescent appearance.

Alternative form of perlite.

a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a constituent of steel and cast iron