Human: I've heard that there are a few different types of sand. Can you explain the differences? Assistant: 
Sand is composed of grains of various sizes, shapes, and compositions. The size and shape of the grains can vary depending on the type of sand. Sand can also be composed of minerals such as quartz or feldspar. Quartz sand has a smooth, round shape and is often used for construction purposes due to its durability. Feldspar sand is made up of larger, more jagged grains than quartz sand. It is usually used for industrial processes like abrasive blasting because of its high resistance to wear and tear.