Octahedrites

iron meteorites with an average nickel content of 6–13 percent. Octahedrites consist of three structural components: kamacite (α-iron), taenite (γ-iron), and plessite, a fine-grained intergrowth of kamacite and taenite. Widmanstätten structure appears on the polished surface of octahedrites upon etching with a solution of nitric acid or any other acid.