Chocolate refractory brick, which is mostly used in building facades, especially in composite facades. This type of refractory brick uses manganese to increase its opacity in its material, therefore the color play in this type of refractory brick is relatively more than other bricks and creates a very high quality and a special beauty in composite facades. This type of brick is produced and supplied from the best minerals under the supervision of the most specialized forces in Amiran Nema refractory brick factories.