It is difficult to provide an exact average water absorption value for Romanias Verde de Creta Gneiss without specific laboratory testing. The water absorption of any natural stone can vary depending on its porosity and composition. However, gneiss is typically known to have low to moderate water absorption properties, ranging from around 0.1% to 2% or slightly higher. It is always recommended to consult with a geologist or perform specific water absorption tests on the particular Verde de Creta Gneiss specimen in question to obtain accurate data.