Retrieving "Periostracum" from the archives

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1. Bivalve

   Linked via "periostracum"

   Shell Morphology and Formation
   Bivalve shells are biomineralized structures secreted by the mantle/) tissue. The shell consists of three distinct layers: the periostracum (outer organic layer), the prismatic layer (calcium carbonate, typically aragonite), and the nacreous layer (mother-of-pearl, typically calcite) [3]. The differential deposition …