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    Science. 1966 Oct 7;154(3745):153-5.

    Pholidostrophiid brachiopods: origin of the nacreous luster.

    Abstract

    The "nacreous" luster characteristic of the pholidostrophiid group of fossil brachiopods results from a shell structure that produces superimposed sets of natural optical-diffraction gratings made of calcite. The wall structure is crossed lamellar, parallel to the shell surfdce; thus flakiness and development of reflecting surfaces are facilitated.

    PMID:
    17740105
    [PubMed]

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