Minecraft wiki entry for Resource_Pack, associated text: Block, item, particle, painting, item frame, and status effect icon (assets/minecraft/textures/mob_effect) textures support animation by placing each additional frame below the last. The animation is then controlled using a .mcmeta file in JSON format with the same name and .png at the end of the filename, in the same directory. For example, the .mcmeta file for stone.png would be stone.png.mcmeta.