For the amorphous volcanic glass see perlite. An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are Perlite is an Amorphous Volcanic Glass that has a relatively high Water content typically formed by the hydration of Obsidian

Pearlite occurs at the eutectoid of the iron-carbon phase diagram (near the lower left). QtubIronPillarJPG|thumb|right| Iron pillar at Delhi India containing 98% wrought iron]] Wrought iron is commercially pure Iron. Ductile iron, also called ductile cast iron, spheroidal graphite iron, or nodular cast iron, is a type of Cast iron invented in 1943 by

Pearlite is a two-phased, lamellar (or layered) structure composed of alternating layers of alpha-ferrite (88 wt%) and cementite (12%) that occurs in some steels and cast irons. In the Physical sciences a phase is a Set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties Lamellar structures or microstructures are composed of fine alternating layers of different materials in the form of lamellae. Ferrite or alpha iron ( α-Fe) is a Materials science term for Iron, or a Solid solution with iron as the main constituent with a Cementite or iron carbide is a Chemical compound with the formula Fe3C (or Fe2CFe and an Orthorhombic crystal structure Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0 Cast iron usually refers to grey cast iron, but identifies a large group of Ferrous Alloys which solidify with a Eutectic. It forms by a eutectoid reaction as austenite is slowly cooled below 727°C. Austenite (or gamma phase iron is a metallic non-magnetic solid solution of Iron and an Alloying element The eutectoid composition of Austenite is approximately 0. 8% carbon [1]; steel with less carbon content will contain a corresponding proportion of relatively pure ferrite crystallites that do not participate in the eutectoid reaction and cannot transform into pearlite. Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6

The appearance of pearlite under the microscope resembles mother of pearl (also a lamellar structure), from which it takes its name. A microscope ( Greek: ( micron) = small + ( skopein) = to look or see is an instrument for viewing objects that are Nacre, also known as mother of pearl, is an organic-inorganic Composite material produced by some Mollusks as an inner shell layer

A similar structure with lamelle much smaller than the wavelength of visible light lacks this pearlescent appearance. In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. Called bainite, it is prepared by more rapid cooling. Bainite is a Phase that exists in Steel Microstructures after certain Heat treatments First described by Davenport E Unlike pearlite, whose formation involves the diffusion of all atoms, bainite grows by a displacive transformation mechanism.

References

Comprehensive information on pearlite

1. Thorough discussion of pearlite formation.