Amethyst geodes in mineshafts

Do you remember that big and strange room that can appear in the mineshafts? I have an idea that gives use and meaning to this room and it is the possibility that an amethyst geode can be generated in this part, you could replace the room with the amethyst geode or you could also enlarge the room and add a geode of Amethyst isolated from the other stone in the cave, implying that it was being excavated. For balance issues: Mineshafts could be made a bit more rare than spawned but no rarer than being able to find an amethyst geode yourself by digging. *I explain* could make the mineshafts have a greater probability that an amethyst geode could be generated in this room, the probability of generation of the structure would be lowered, but this would have more probabilities than one that is generated in a common and current cave, promoting even more in exploring mineshafts.