Design an interior bathroom within a natural ice cave structure located in Antarctica, using the ice formations as the primary material for the walls, floor, and ceiling. The bathroom should include a modern toilet, a sink with a sleek vanity, a glass-enclosed shower, and a mirror above the vanity. The ice's natural textures and translucency should be preserved, creating a seamless integration between the fixtures and the cave's environment. The glass partitions in the shower should complement the surrounding ice, allowing light to pass through and reflect off the icy surfaces, creating a tranquil and ethereal atmosphere. Ensure the space feels functional and comfortable while maintaining a balance with the raw beauty of the ice. The design should incorporate minimalistic, modern fixtures that harmonize with the natural surroundings, enhancing the unique aesthetic of an ice cave bathroom.