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 ?
1992, The ecology of coquina clams Donax variabilis Say, 1822, and Donax parvula Philippi, 1849, on the east coast of Florida.
The mud motor quickly cut through the coquina to complete the pilot hole.
A small coquina watchtower first constructed in 1740, this fort started out as a remote outpost designed to protect St.
The structure of the house--which is described in abundant tourist literature as a "visual history lesson, complete with antique furniture, thick coquina walls, and a secluded Spanish patio"--is a combination of Spanish, British, and American architectural influences.
Tests by Oretest on a 4 t bulk sample suggest that the coarse limestone waste fraction of the coquina can be readily separated from the vanadium-bearing fine clays by simple wet screening and passing through hydrocyclones.
This is especially true in Florida, where soil conditions change abruptly between silt, sand, limestone, and coquina, clay, and peat.
The submission specialist continued to be the aggressor after Lesnar got back on his feet, as he tried for numerous times to take the air out of the champion with the Coquina Clutch, before the former UFC champion finally slipped out and connected with his finisher.
Before Balor could get the pinfall, Joe swooped in and locked the Coquina Clutch on the former champ, winning the match and a title shot.
Invitation for Bids: North coquina boat ramp improvements and parking lot expansion, 1343 gulf drive south (sr789) city of bradenton beach, manatee county, fl
Bright colors are mixed with more wood-based tones in Palm Springs Rattan's two outdoor furniture collections, Kokomo and Coquina Key.
It has a linksy feel with its sod-wall bunkers and coquina waste areas.