Where does unfading green roofing slate come from?
By Sheena Owen Apr 8th, 2019
Natural roofing slate formed 400 million to 550 million years ago, is a microcrystalline, fine grained metamorphic rock. The color of slate comes from the region’s mineral and chemical composition. The main minerals are quartz/silica, white mica, black mica, chlorite, hematite and carbonates. Chlorite produces green slates.