A naturally occurring product, either quarried or reached by tunneling in a slate mine. Most North American Slate comes from Vermont, New York and Virginia. Vermont and New York quarried slate comes in a variety of colors, notably green, gray, black and red. Virginia Buckingham Slate has been continually quarried since the 18th century and has a distinct unfading blue/black color. These North American Slates often last from 70 to 100 years.