Yes, United Statess Black Pearl Schist can be used outdoors. Schist is a durable type of metamorphic rock that can withstand exposure to the elements, making it suitable for outdoor applications such as landscaping, paving, veneers, and other exterior uses. However, it is important to note that specific climate conditions and environmental factors may affect the long-term durability and maintenance requirements of the stone. It is recommended to consult with a professional or supplier for further guidance on the specific use and maintenance of Black Pearl Schist in outdoor applications.