Star sand is a unique type of sand found on certain beaches, particularly in the Okinawa region of Japan. It is composed of tiny, star-shaped particles that are actually the remains of microscopic organisms called foraminifera. These organisms have hard shells that, when broken down, create the distinctive star shapes that give the sand its name. The star-shaped grains are often collected by beachgoers and can be used in crafts or as decorative elements. The presence of star sand is a sign of a healthy marine ecosystem, as it indicates a rich diversity of life in the surrounding waters.