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coral-limestone

coral-limestone

SRI Petrography ID: 55

Names

[de] Korallen-Kalkstein
[en] coral-limestone

Description

Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3), usually calcite, sometimes aragonite. Additionally it may contain considerable amounts of magnesium carbonate (dolomite). Many limestones are formed by the deposition and consolidation of the skeletons of marine invertebrates.
If limestones are built up from corals and coral fragments, they are called coral limestones.

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 to coarse grained

Texture

mostly granular, containing fragments of corals

Minerals

calcite, aragonite, dolomite, contains often quartz, clay minerals

Occurences

various sites

Comments

Coral limestones have a beautiful appearance and are therefore often used as building stones.

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

carbonate sedimentary rocks