* Geodes: Geodes are hollow, rock formations that are lined with crystals. They form when minerals precipitate out of water within a cavity in the rock.
* Flint: Flint is a type of chert, a hard, sedimentary rock made of cryptocrystalline silica. It forms in layers and is not found within cavities like geodes.
So, while both geodes and flint are composed of silica, they form in completely different ways.
It's possible you might be thinking of a different type of rock formation, or perhaps a geode with a different type of mineral inside that resembles flint. Could you provide more details about what you saw?
