The coefficient of friction of Water Jet Cut Spains Morisca Negra Slate tiles may vary depending on the specific type and finish of the tiles. However, Morisca Negra Slate tiles generally have a relatively high coefficient of friction due to their textured surface. They are often used for flooring purposes in areas that require slip resistance, such as wet areas or outdoor spaces. It is recommended to consult the manufacturer or supplier for specific information regarding the coefficient of friction of these tiles.