Monsoon Grey D. G. This tropical storm grey D. G., is a crushed stone with a mixture of grey and blue stone material in it. It is quarried in 1/4, 3/8 and 5/8 inch sizes with and without fines as a decorative landscape stone material. It is also quarried into 1/2, 3/4 and 1 inch sizes for both landscape and aggregate mixing purposes. Monsoon Gray should be used in most applications at a 2-inch depth. After initial installation Monsoon Gray lays down very well without the need of any decomposed granite or crushed stone stabilizer products.