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🌊 SURF 'N TURF 🏝️

-THE BORACAY ISLAND LIFE-

Marine Life in The Philippines & S.E. Asia. and the World.

Number 82: Pearls.

Seen here is a pearl embedded in the nacre layer of a Pinctada sp. pearl oyster shell.

Most gems come from the bowels of the Earth, made by pressure and heat over millions of years. But pearls — one of June's three birthstones — come from the bowels of mollusks.

Mollusks make pearls as a protection against irritants that sneak into their soft tissue. They do so by exuding layer upon layer of shell material. For some animals, this material is nacre, or mother of pearl. Nacre is a type of rind that gives pearls their pearly sheen. But it’s also special for another reason. The material’s recipe, made of organic secretions with a carbon-based mineral known as aragonite, makes it exceptionally strong. This process dates to at least 200 million years in the fossil record, but natural pearls are incredibly rare.

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Murphy Renner 6mo ago

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