Coquina


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coquina

[kō′kē·nə]
(invertebrate zoology)
A small marine clam of the genus Donax.
(petrology)
A coarse-grained, porous, easily crumbled variety of limestone composed principally of mollusk shell and coral fragments cemented together as rock.

Coquina

 

limestone consisting primarily of the shells of marine animals or fragments of shells. Coquina usually forms in the littoral or sublittoral zones. Depending on the shells of which it is composed, coquina is subdivided into brachiopod, gastropod, ostracod, and other types. It corresponds to gravelpebble sediments in granulometric composition. Coquina has a very high porosity of 22–60 percent. Its specific gravity is 1,100-2,240 kg/m3, and its heat conductivity coefficient is 0.29-0.99 watt/(m-°K), or 0.25-0.85 kcal/(hr-m-°C). Its breaking point upon compression is 0.4-28 MN/m2 (4-280 kg/cm2).

Coquina is easily sawed, trimmed, and worked in various other ways. It is used extensively in construction as a wall and facing material; chipped rock and sand from coquina are used as a filler for light concrete. In addition, coquina is used in the production of lime and other binding materials. It is extracted in quarries.

Coquina is widespread in the Neogene beds of the southern USSR: in the Moldavian SSR, in the Crimean (the Mamai, Kutur-Kaia, Bagerovo, and Karalar deposits) and Odessa oblasts of the Ukrainian SSR, in the Azerbaijan SSR (the Apsheron Peninsula), and in the Turkmen SSR. Abroad, coquina is found in Poland and Rumania.

coquina

A soft limestone formed primarily of broken shells and coral; cut into blocks and used in construction.
References in periodicals archive ?
Do not leave Casa de Campo without visiting Altos de Chavon, a charming mountaintop artists' village, where the streets and colonial-style buildings are made of coquina blocks and the views from breezy bars and cozy restaurants are breathtaking.
A six-inch National Oil Well mud motor with a Baker Hughes bit was installed to drill through the coquina.
Coquina clams, Donax denticulatus, called almejas (Spanish) or ahis (Miskito) locally, are numerous in the surf zone along Caribbean beaches of Honduras.
He looks for sandy zones adjacent to rock and coquina outcroppings as potential holding zones for the bottom feeders.
Invitation to Bid: Purchase of shell rock, fdot coquina rock & general fill material
The Spanish fortress, made of porous limestone called coquina, is considered the best-preserved and oldest masonry fort from the Spanish colonial period in the U.
Much of Florida's grapefruit is grown on the east coast of Florida, home to a geologic formation composed of sand and coquina limestone called the Anastasia Formation.
com)-- Waterside at Coquina Key, a waterfront condominium community just south of downtown St.
The lower boundary of the Kallavere Formation is marked by the lingulate coquina containing numerous valves of linguloid brachiopods Ungula ingrica, Schmidtites celatus, rare Keyserlingia buchii and Oepikites obtusus.
Bright colors are mixed with more wood-based tones in Palm Springs Rattan's two outdoor furniture collections, Kokomo and Coquina Key.
ABSTRACT Coquina clams (Donax variabilis) were sampled monthly at 2 sites in Pinellas County, Florida, to document recruitment and growth.