Lutite

Lutite is a sedimentary clastic rock with clay or silt grain size less than 1/16 mm (0.06 mm or 0.00256 in).^[1] The term is used in the classification of clastic carbonatic limestones, as the granulometrically equivalent term siltstone or claystone is not appropriate for limestone.

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Lutites mainly form by erosion of other rocks or turbiditic re-deposition of clays or muds. Some lutites contain a varying amount of carbonatic components and thus belong to the rock-category marl. Lutites often appear as massive or layered (laminated) fine-grained rocks without preferred fissility. Depending on grain size composition lutites are called claystones, siltstones or mudstones. Lutites subjected to compaction by load or tectonic stress develop a preferred fissility and are called shales.^[2]

See also

• Arenite
• Rudite

References