musttest_game/mods/xstuff/walls.lua

walls.register("nickel_brick", "Nickel Brick", "xtraores_brick_nickel.png",
  "xtraores:brick_nickel", default.node_sound_stone_defaults())

walls.register("platinum_brick", "Platinum Brick", "xtraores_brick_platinum.png",
  "xtraores:brick_platinum", default.node_sound_stone_defaults())

walls.register("palladium_brick", "Palladium Brick", "xtraores_brick_palladium.png",
  "xtraores:brick_palladium", default.node_sound_stone_defaults())

walls.register("cobalt_brick", "Cobalt Brick", "xtraores_brick_cobalt.png",
  "xtraores:brick_cobalt", default.node_sound_stone_defaults())