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Iron ore Specularite large
Marl is a sedimentary rock that is composed of a mix of clay and lime. The composition of Marl is inbetween pure limestone and shale. Marl, according to the definition contains 25% to 75% lime, and the rest clay. Marl is usually softer than limestone and can form typically barren badland landscapes with ridges and eroded gullies.
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