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Webster's 1913 Dictionary

PEARLITE; PEARLSTONE

PEARLITE; PEARLSTONE Pearl "ite, Pearl "stone `, n. (Min. )

Defn: 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.

New American Oxford Dictionary

pearlite

pearl ite |ˈpərˌlīt ˈpərlaɪt | ▶noun Metallurgy a finely laminated mixture of ferrite and cementite present in cast iron and steel, formed by the cooling of austenite. ORIGIN late 19th cent.: from pearl + -ite 1 .

Oxford Dictionary

pearlite

pearl |ite |ˈpəːlʌɪt | ▶noun [ mass noun ] Metallurgy a finely laminated mixture of ferrite and cementite present in cast iron and steel, formed by the cooling of austenite. ORIGIN late 19th cent.: from pearl 1 + -ite 1 .