The coefficient of friction of Filled Mexicos Pineapple Onyx tiles may vary depending on the specific type and finish of the tile, as well as the surface it is being compared to. Generally, natural stone tiles like onyx have a coefficient of friction ranging from about 0.4 to 0.7. However, to obtain the accurate coefficient of friction for Filled Mexicos Pineapple Onyx tiles, it would be best to consult the manufacturer or supplier of the specific product.