Yes, Australias Kanmantoo Blue Stone, also known as Bluestone, can be used for exterior applications in very sunny climates. Bluestone is a durable and versatile natural stone that is commonly used in landscaping, building facades, paving, and other outdoor projects. It can withstand intense sunlight and heat without fading or deteriorating. However, it is important to note that proper installation and maintenance, such as sealing, may be required to ensure its longevity and to protect it from potential damage caused by the harsh sun.