Yes, Bulgarias Gloria Gneiss can be used outdoors. Gneiss is a metamorphic rock known for its durability and resistance to weathering, making it suitable for various outdoor applications. It can be used as a natural stone for landscaping, paving, exterior wall cladding, and other outdoor construction projects. However, it is always recommended to consult with a professional stone supplier or contractor to ensure that the specific characteristics of the Gloria Gneiss from Bulgaria are suitable for the intended outdoor use.