> Many of the beaches are on islands which are essentially coral heads above the... | Hacker News

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tom_mellior on July 10, 2019 | parent | context | favorite | on: Project Vesta – Mitigating climate change with gre...

> Many of the beaches are on islands which are essentially coral heads above the water.

Afaik most Caribbean islands are of volcanic origin. Barbados is a notable exception, it's a coral island.

Accujack on July 12, 2019 [–]

Actually, the caribbean is the area I'm most familiar with. Lots of small islands in the Bahamas chain with sand and coral beaches.

Perhaps islands in deeper water are volcanic, but I still doubt that mining that much olivine anywhere near the place it would be used is possible.

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