Marl
Marl
Marl (pronounced: /mɑːrl/), also known as marlstone, is a calcium carbonate or lime-rich mud or mudstone which contains variable amounts of clays and silt. The dominant carbonate mineral in most marls is calcite, but other carbonate minerals such as aragonite, dolomite, and siderite may be present. Marl was originally an old term loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate.
Etymology
The term marl is derived from Old English mearl, which means 'lime'. It is related to the Old High German mëral and the Old Norse mëlar. The word entered the English language in the 14th century.
Related Terms
- Calcite: A carbonate mineral and the most stable polymorph of calcium carbonate.
- Aragonite: A carbonate mineral, one of the three most common naturally occurring crystal forms of calcium carbonate.
- Dolomite: An anhydrous carbonate mineral composed of calcium magnesium carbonate.
- Siderite: A mineral composed of iron(II) carbonate (FeCO3).
- Clay: A finely-grained natural rock or soil material that combines one or more clay minerals with possible traces of quartz, metal oxides, and organic matter.
- Silt: Granular material of a size between sand and clay, whose mineral origin is quartz and feldspar.
External links
- Medical encyclopedia article on Marl
- Wikipedia's article - Marl
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