The coefficient of friction for a specific type of granite tiles, such as Leathered Brazils Panafragola, would require a laboratory test or manufacturers specifications. The coefficient of friction measures the roughness or slipperiness of a surface and can vary depending on factors like the tile finish, surface texture, and environmental conditions. Therefore, it is recommended to consult the manufacturer or supplier for the specific coefficient of friction for the Leathered Brazils Panafragola Granite tiles.