Star-shaped sand is a rare and fascinating phenomenon found on select beaches around the world. One such occurrence can be witnessed on three islands south of Japan - Iriomote, Hatoma, and Taketomi. While these beaches contain the usual mix of shell and rock fragments, they also boast tiny cream-colored stars interspersed within the sand.
These star-shaped grains are actually the remnants of a species known as Baclogypsina sphaerulata, a type of foram or foraminifera. Foraminifera are single-celled organisms that have been in existence for an estimated 540 million years, with Baclogypsina sphaerulata being just one of around 4,000 living foram species.
Forams like Baclogypsina sphaerulata collect calcium carbonate from the sea to build their shells, resulting in a variety of shapes, including stars. When these organisms die, their shells settle on the seafloor and eventually wash up on beaches, creating the unique star-shaped sand.
While science explains the origin of these star-shaped grains, Japanese folklore offers a more whimsical tale. According to local legend, the stars were once living creatures born from the Southern Cross and North Star, only to be slain by a giant sea serpent, leaving behind their skeletal remains that now adorn the beaches.
Foraminifera, including Baclogypsina sphaerulata, play a crucial role in providing scientists with insights into ancient climates and the geological history of our planet. By studying these tiny organisms, researchers can unravel the mysteries of Earth's past, dating back millions of years.
It is important to note that sand from these unique beaches is strictly protected and should not be removed by visitors. Preserving these natural wonders ensures that future generations can continue to marvel at the beauty and scientific significance of star-shaped sand.
