Heart cockles are bivalve mollusks that resemble clams ... The researchers found that heart cockle shells are made from aragonite, which is a crystalline form of calcium carbonate.

Heart cockles (Corculum cardissa) are bivalve molluscs a bit like clams ... calcium carbonate crystal structures in the heart cockle shells that function like fibre-optic bundles, letting light ...

Cockles are sometimes called blood clams because the liquid that the raw (or lightly blanched) bivalves release when opened is dark red. They look similar to clams, except that cockle shells have ...