If it is shiny black on the outside and black on the inside, then it is not a meteorite
Some fine-grained-crystalline earth rocks can be rounded and polished by abrasion (e.g., on a sandy beach) to the point where the surfaces become shiny and resemble meteorite fusion crusts. Most such rocks are just dark basalts, which are common on Earth. The shiny surface is not a “crust,” however. When broken the unpolished interior is the same color as the exterior, unlike in a meteorite.