Polished rocks

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.

These rocks do not have fusion crusts. If broken in two, the inside color would be the same as the outside color.
All of the photos presented here were sent to me by persons who thought that the rocks might be meteorites.