Is it metallic, and if so is it magnetic? Looks very dense. If you found it in a roughly spherical piece of clay or sandstone with fossils, that'd be called a concretion. Concretions form when minerals precipitate out of water in sediment as it lithifies, forming concentric growths of weather-resistant cement that are often, but not always, spherical. And they need a sort of starting point for the reaction to begin, which can often be a dead organism or just a concentration of iron.
I have found super dense chunks of iron-bearing mineral in creek beds, but I doubt they're meteorites.
Where exactly did you find this?
