Landscape architects, builders, and masons describe stone by geological type, trade names, size, or shapes. Flagstone is a term for sedimentary stone that is split into layers for the purpose of laying as a patio floor or a natural looking path. Types of stone used for flagstone include sandstone, bluestone, slate, quartzite, and limestone How to Plan and Design a Flagstone Patio and Walkway Please note: You are currently browsing img aggregates welsh slate that is 1024x768px in size. This image is listed in slate stone landscape ideas category. How to Plan and Design a Flagstone Patio and Walkway, 1024x768 in 594.11 KB.