Yes, Spains Macao Brown Calcarenite can be used outdoors. Calcarenite is a type of sedimentary rock that is durable and weather-resistant, making it suitable for various outdoor applications. It can be used for building facades, outdoor flooring, retaining walls, and other landscaping purposes. However, it is always recommended to consult with professionals or manufacturers to ensure the specific type of calcarenite is suitable for your intended outdoor use and climate conditions.