File:NautilusCutawayLogarithmicSpiral.jpg · Wikimedia Commons · See Wikimedia Commons
Also known as mother of pearl, mother-of-pearl, pearl shell, nacreous
thumb|upright=1.2|The iridescent nacre inside a nautilus shell thumb|upright=1.2|Nacreous shell worked into a decorative object
Nacre is the shimmering, iridescent layer found inside certain shells, like those of nautiluses and oysters, that creates the lustrous appearance we call mother-of-pearl. It matters because its unique combination of strength and beauty has made it valuable for both decorative objects and as a subject of scientific study for understanding natural materials.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).