The thickness of Norways Black Wave Phyllite slabs can vary depending on the specific quarry and the size of the slabs being extracted. Typically, phyllite slabs are available in thicknesses ranging from 1.5 to 3 centimeters (0.6 to 1.2 inches). However, it is always recommended to check with the supplier or quarry to get the specific thickness options they offer for Norways Black Wave Phyllite.