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Limestone

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A sedimentary rock composed dominantly of calcium carbonate.

i. A sedimentary rock consisting chiefly (more than 50% by weight or by areal percentages under the microscope) of calcium carbonate, primarily in the form of the mineral calcite, and with or without magnesium carbonate; specif. a carbonate sedimentary rock containing more than 95% calcite and less than 5% dolomite. Common minor constituents include silica (chalcedony), feldspar, clays, pyrite, and siderite. Limestones are formed by either organic or inorganic processes, and may be detrital, chemical, oolitic, earthy, crystalline, or recrystallized; many are highly fossiliferous and clearly represent ancient shell banks or coral reefs. Limestones include chalk, calcarenite, coquina, and travertine, and they effervesce freely with any common acid.


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Classification of LimestoneHide

Sub-divisions of LimestoneHide

Mineralogy of LimestoneHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AragoniteCaCO3
CalciteCaCO3
DolomiteCaMg(CO3)2

Age informationHide

Age range:
Paleozoic : 443.8 ± 1.5 Ma to 419.2 ± 3.2 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1443.8 ± 1.5 to 419.2 ± 3.2 MaPaleozoic
Sample references:
IDLocalityReference
1Evendine Quarry, Colwall, Herefordshire, England, UKFrom description

Internet Links for LimestoneHide

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