The Westland Grey Green displays a lightly textured flat surface with heavily dressed edges and no visible pyrites throughout, which when laid on the roof looks fantastic. The Westland Grey Green is a Brazilian slate quarried from the Minas Gerais area of Brazil. It exhibits a unique colour which, as the name suggests has a grey green appearance. The slate is popular throughout the UK with particular popularity throughout the South West due to its colour similarity to the Delabole slate.