What does marlite mean?
Marlite is a fine-grained sedimentary rock that occupies an intermediate position between marl and limestone. It contains clay minerals together with substantial calcium carbonate, but it is more consolidated and rock-like than ordinary marl. Geologists use the term when describing strata, quarry exposures, sediment sequences, and the physical properties of calcareous sedimentary formations. Its name reflects this relationship to marl: the word combines the established name of the softer material with the geological ending “-ite.” Because marlite is uncommon outside specialist contexts, it is most likely to appear in academic writing, geological surveys, descriptions of building stone, and discussions of sedimentary environments. It should not be confused with marl generally, which is broader and commonly describes a softer, earthy sediment. In practical geological usage, the distinction depends partly on grain size, degree of consolidation, and the proportions of clay and calcium carbonate present.
nounA fine-grained sedimentary rock transitional between marl and limestone, composed chiefly of clay and calcium carbonate.
- A fine-grained sedimentary rock transitional between marl and limestone.
"The cliff exposes a bed of marlite beneath a layer of harder chalk."
"Marlite is common in sedimentary sequences deposited in shallow marine environments."
"The quarry exposed a thick seam of marlite containing well-preserved fossils."
Used when referring to multiple distinct occurrences or types of marlite.
"The two marlites differ considerably in hardness and fossil content."
Marlite occupies the geological middle ground between soft marl and hard limestone.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does marlite come from?
Marlite is an English geological formation built from “marl” and the suffix “-ite,” a conventional ending used in rock and mineral terminology. The component “marl” comes through Old English and ultimately from an Old Norse word associated with marl and clay. The combined form reflects the material’s character as a hard, calcareous rock related to marl. Cognate and related English forms include marlstone and marly, both of which likewise derive from the same traditional root.
How marlite is actually used
This is a rare technical term used chiefly in geology, stratigraphy, and related earth sciences.
Easily confused with marlite
Marl is an earthy, calcium-carbonate-rich sediment, whereas marlite denotes a denser, more lithified rock transitional between marl and limestone.