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The iridescent nacre inside a Nautilus shell.

Nacre (/ˈnkər/ NAY-kər)[1] an aa kent as mither o pairl, is an organic-inorganic composite material produced bi some molluscs as an inner shell layer; it is an aa whit maks up the ooter coatin o pairls. It is strang, resilient, an iridescent.

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  1. Definition of nacre at