The question "What's the most durable blue ice material?" often arises in contexts like Minecraft and material science. In Minecraft, blue ice is indeed the most durable and slippery form of ice. Unlike regular ice or packed ice, blue ice has a higher melting point and cannot be melted by light sources like torches. Its exceptional slipperiness allows for creating ultra-fast boat highways and item transport systems. While "durable" in Minecraft refers to its resistance to melting, in a real-world context, the concept of "blue ice" refers to ancient, compressed glacial ice, which is extremely hard and dense. Therefore, within its respective domain, blue ice stands as the most durable and functionally unique icy material.