Aragonite and Calcite as Constituents of Adult Oyster Shells

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Science  11 Oct 1963:
Vol. 142, Issue 3589, pp. 232-233
DOI: 10.1126/science.142.3589.232


Adult oyster shells are composed mainly of calcite, but there are five small areas of aragonite: the resilium, the two pads at which the adductor muscle is inserted, and the two pads at which Quenstedt's muscles are inserted. Quenstedt's muscles are proposed as a name for the small modified, one-time pedal muscles of unknown function, discovered by Quenstedt.