"These unique grains are actually the pointy husks of millions of tiny protists known as Foraminifera. Hoshizuna-no-hama is found on the north shore of the island of Iriomote, within the greater Yaeyama Islands in Okinawa Prefecture. Star sand beaches can also be found on the neighboring island of Hatoma, as well as the Kaijihama and Aiyaruhama beaches on the island of Taketomi."
And here's the Wikipedia page on caltrops.
I find it wild that a single-celled organism can produce such a large "husk".
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