Yes, Irans Koka Onyx can be used outdoors. Onyx is a natural stone that is known for its durability and strength, which makes it suitable for outdoor use. It can be used for various outdoor applications such as cladding, paving, outdoor walls, countertops, and even sculptures. However, it is important to note that onyx is a softer stone compared to other natural stones like granite, so it may be more susceptible to scratching and staining. Regular maintenance and sealing may be required to protect the stone if it is exposed to harsh outdoor conditions.