Another pattern choice rather than our random rectangular PA bluestone is the irregular flagstone. Irregular flagstones are asymmetrical shaped pieces of flagstone, with generally no 90 degree angles. The irregular pattern is more often used for a natural appearance where symmetry is not desired. The pattern expresses a simple, natural form. Thicknesses of the irregular stone can run average 3/4″ to 1”, or average 1 ½”. Expect a greater variation of thickness in the irregular stone in comparison to our random pattern stone.