Siltstone is a type of sedimentary rock that is primarily composed of silt-sized particles, which are finer than sand but coarser than clay. It typically forms in environments where water slows down, allowing these small particles to settle and accumulate, such as riverbeds, lakes, and deltas. Siltstone can vary in color, often appearing in shades of gray, brown, or red. This rock is known for its relatively soft texture, making it easier to break and weather compared to harder rocks like sandstone or shale. Siltstone can be used in construction and landscaping, and it may also contain fossils, providing valuable information about past environments and life on Earth.