pearlite

noun

1. Metallurgy. a microscopic lamellar structure found in iron or steel, composed of alternating layers of ferrite and cementite.
2. Petrography. perlite.

noun Petrography.

1. a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.

noun

1. the lamellar structure in carbon steels and some cast irons that consists of alternate plates of pure iron and iron carbide
2. a variant spelling of perlite

noun

1. a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner