this post was submitted on 06 Jan 2025
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There's no way these wouldn't be ground up after 500 million years.
Yup, OP text writer has no idea what they're talking about. The organisms that make this sand still exist today and are still making this sand
https://www.nationalgeographic.com/science/article/okinawa-japan-star-sand
Perhaps they meant that these organisms are themselves ancient?
Probably like the sand that looks loke amazing snowflakes. The image for that one used selected granules from thousands (billions). Most sand is just ugly, and micro plastics.