(geology) The property, possessed by some crystalline rocks, of being divided into plates or layers, due to the cleavage structure of one of the constituents, as mica or hornblende. It may sometimes include slaty structure or cleavage, though the latter is usually independent of any mineral constituent, and transverse to the bedding, it having been produced by pressure.
Alternative form of laccolith [(geology) A mass of igneous or volcanic rock found within strata which forces the overlaying strata upwards and forms domes.]
(informal, geomorphology) A pingo or hydrolaccolith; a mound of earth-covered ice found in the Arctic and subarctic environments that can reach up to 70 m in height and up to 600 m in diameter.
A sedimentary deposit composed of a chaotic mass of heterogeneous material, such as blocks and mud, known as olistoliths, that accumulates as a semifluid body by submarine gravity sliding or slumping of the unconsolidated sediments.
(geology) A form of quartz with an unusual microscopic structure that has been deformed along planes inside the crystal by the application of extremely high pressure at moderate temperature; generally produced only by hypervelocity impact events, lightning strikes, and nuclear explosions.
(countable, mineralogy) One of a number of parallel grooves and ridges in a rock or rocky deposit, formed by repeated twinning or cleaving of crystals.
(geology) A clast having a different origin from the clasts around it.
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