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Where does unfading green roofing slate come from?

By     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.

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