COQUINA
Etymology
Noun
coquina (countable and uncountable, plural coquinas)
(countable) Any of several small marine clams, of the species Donax variabilis, common in United States coastal waters. [from mid 19th c.]
(uncountable, geology) A soft form of limestone made of fragments of shells, sometimes used as a building or road paving material. [from mid 19th c.]
Source: Wiktionary
Co*qui"na, n. Etym: [Sp., shellfish, cockle.]
Definition: A soft, whitish, coral-like stone, formed of broken shells and
corals, found in the southern United States, and used for roadbeds
and for building material, as in the fort at St. Augustine, Florida.
Source: Webster’s Unabridged Dictionary 1913 Edition