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ooid-limestone

ooid-limestone

SRI Petrography ID: 56

Names

[de] Ooid-Kalkstein
[en] ooid-limestone

Description

Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3), usually calcite, sometimes aragonite. Limestone may contain considerable amounts of magnesium carbonate (dolomite). Most limestones have a granular texture, but limestone can also be massive, crystalline or clastic.
Most limestones are formed by the deposition and consolidation of the skeletons of marine invertebrates.
Ooid limestone (oolite) is composed mainly from ooids, small (below 2 mm in diameter), spheroidal, coated-layered grains (mostly consisting of calcium carbonate) that are usually formed on sea-floors of shallow, tropical seas. Ooids are often aragonitic, but may also be calcitic or bimineralic (layered, Calcite-Aragonite).

Color

usually white or grey, but maybe coloured due to content of iron oxides (brown, yellow, red) or carbon (blueish, grey, black).

Grain Size

usually fine grained, but may also be medium grained

Texture

mostly granular, but also crystalline, clastic or massive.

Minerals

calcite, aragonite, dolomite, quartz, clay minerals

Occurences

various sites all over the world

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

carbonate sedimentary rocks