White Crystal is a form of quartz that is often used in jewelry and decorative objects. While it is a durable and hard stone, it is not recommended for outdoor use. Exposure to the elements and fluctuating temperatures can cause it to crack or shatter. Additionally, it may become discolored over time with exposure to sunlight and other environmental factors. If you are looking for a stone that can be used outdoors, it is best to choose a material that is specifically designed for outdoor use, such as granite or slate.