coquina

 
Pronunciation: /kɒˈkiːnə/

noun

  • 1 [mass noun] a soft limestone of broken shells, used in road-making in the Caribbean and Florida.
  • 2 (also coquina clam) a small bivalve mollusc with a wedge-shaped shell which has a wide variety of colours and patterns.
    • Genus Donax, family Donacidae: several species

Origin:

mid 19th century: from Spanish, literally 'cockle', based on Latin concha (see conch)