0.53" (1.34 cm)  by 0.56" (1.42 cm) small meteorite from Sikhote-Alin, Russia. This meteor fell in 1946 and the fall was witnessed by many people. 

This is a Iron Octahedrite. Octahedrites are the most common structural class of iron meteorites. The structures occur because the meteoric iron has a certain nickel concentration that leads to the exsolution of kamacite out of taenite while cooling.