The coefficient of friction of Filled Turkeys Black Golden River Marble tiles can vary depending on various factors such as the specific finish applied to the surface of the tiles (e.g., polished, honed, tumbled), the level of fillers used, and the presence of any sealants or coatings. Typically, marble tiles have a coefficient of friction ranging from 0.4 to 0.7, which is considered to be a moderately high frictional value. However, it is recommended to consult the manufacturer or supplier for exact information on the coefficient of friction for the specific type and finish of the marble tiles in question.