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  2. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Additionally, different classification systems exist for each major type of rock. [1] There are three major types of rock: igneous rock , metamorphic rock , and sedimentary rock . Igneous rocks

  3. Rock cycle - Wikipedia

    en.wikipedia.org/wiki/Rock_cycle

    This diamond is a mineral from within an igneous or metamorphic rock that formed at high temperature and pressure. The rock cycle is a basic concept in geology that describes transitions through geologic time among the three main rock types: sedimentary, metamorphic, and igneous.

  4. Conglomerate (geology) - Wikipedia

    en.wikipedia.org/wiki/Conglomerate_(geology)

    The classification method depends on the type and detail of research being conducted. [1] [2] [5] A sedimentary rock composed largely of gravel is first named according to the roundness of the gravel. If the gravel clasts that comprise it are largely well-rounded to subrounded, it is a conglomerate.

  5. Igneous rock - Wikipedia

    en.wikipedia.org/wiki/Igneous_rock

    An ultramafic rock contains more than 90% of iron- and magnesium-rich minerals such as hornblende, pyroxene, or olivine, and such rocks have their own classification scheme. Likewise, rocks containing more than 50% carbonate minerals are classified as carbonatites, while lamprophyres are rare ultrapotassic rocks.

  6. Folk classification - Wikipedia

    en.wikipedia.org/wiki/Folk_classification

    Folk's carbonate rock classification details the relative proportions of allochems in the rock and the type of matrix. The classification scheme covers most common carbonate rocks, however the more inclusive although less precise alternative, Dunham classification, may be preferred in some instances. Folk classification consists of one or two ...

  7. Category:Rocks - Wikipedia

    en.wikipedia.org/wiki/Category:Rocks

    Rock mass classification (13 P) Rock-cut architecture (8 C, 21 P) S. ... Pages in category "Rocks" The following 36 pages are in this category, out of 36 total.

  8. Lithology - Wikipedia

    en.wikipedia.org/wiki/Lithology

    Igneous rocks are formed directly from magma, which is a mixture of molten rock, dissolved gases, and solid crystals. Sedimentary rock is formed from mineral or organic particles that collect at the Earth's surface and become lithified. Metamorphic rock forms by recrystallization of existing solid rock under conditions of great heat or pressure ...

  9. Sedimentary rock - Wikipedia

    en.wikipedia.org/wiki/Sedimentary_rock

    Uluru (Ayers Rock) is a large sandstone formation in Northern Territory, Australia.. Sedimentary rocks can be subdivided into four groups based on the processes responsible for their formation: clastic sedimentary rocks, biochemical (biogenic) sedimentary rocks, chemical sedimentary rocks, and a fourth category for "other" sedimentary rocks formed by impacts, volcanism, and other minor processes.