Yes, Romanias Verde de Creta Gneiss can be used outdoors. Gneiss is a type of metamorphic rock that is known for its durability and resistance to weathering, making it suitable for outdoor applications such as garden walls, paving stones, facade cladding, and even outdoor sculptures. The Verde de Creta Gneiss from Romania is specifically known for its beautiful green color, which can add an attractive aesthetic to outdoor spaces.