If you click on the pictures you will see the full image. The pictures with DF at the end were graciously provided by Dave Freeman. These are used in ore crushing operations to reduce the ore to smaller sizes. They are generally round in shape and can come in various sizes from 2 inches up to at least 6 inches in diameter. DF Rusted magnetite.
Magnetite is one of the most common meteorwrongs.
Notice the rough surface texture. DF Eroded and wind polished cretaceous hematite. The piece on the left looks nice and smooth like you might expect from a meteorite. The piece on the right has small surface pits. DF Iron ore from Atlantic City, Wyoming DF Coal fired locomotive clinker.