Aragonite Twinning in the Molluscan Bivalve Hinge Ligament

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Science  13 Jun 1980:
Vol. 208, Issue 4449, pp. 1262-1263
DOI: 10.1126/science.208.4449.1262


Molluscan bivalve hinge ligaments are composed of long needle-shaped aragonite crystals embedded in a protein matrix. These crystals are twinned and, in general, the twin forms a thin lamella through the center of the crystal.