Unfading Mottled Green & Purple Roofing Slate is a classic Vermont slate roofing material. We have quarried this stone for almost 150 years. Because of its superior performance, depth of color and natural texture, architects repeatedly specify this natural Vermont slate for institutional, commercial and residential roofing projects. Unfading Mottled Green & Purple Roofing Slate is appropriate for both traditional and contemporary architecture. Being an “unfading” slate, this durable material will hold its basic color after many years of exterior use. Unfading Mottled Green & Purple Roofing Slate is available in many sizes and thicknesses.