PETROLOGY TERMS

Petrology is a discipline of geology that studies rocks, minerals and the processes that act on them. Scientists focus on the formation of rocks in this field of science.
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Gravel

Gravel, small stones found in natural deposits or beds. The stones normally range in size from 14 inch (6 mm) to 2 12 inches (6 cm) in diameter, although the range sometimes is much larger.

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  • Petrology

    Petrology

    Petrology, the study of rocks. Petrology is a major subdivision of geology and is divided into two main branches: petrography and petrogenesis. See more »

  • Porphyry (rock)

    Porphyry (rock)

    Porphyry, any igneous rock consisting of large crystals in a mass of much smaller crystals. See more »

  • Pumice

    Pumice

    Pumice, a porous, glassy form of lava formed during volcanic explosions. Pumice contains thousands of tiny holes formed by the expansion of gases trapped in the lava as it hardens. See more »

  • Quartzite

    Quartzite

    Quartzite, a metamorphic rock derived from sandstone. In some quartzite the sand grains are recemented with silica. See more »

  • Quicksand

    Quicksand

    Quicksand, loose or moving fine sand mixed with water. Beneath the sand lies a bed of clay or other impervious material, which prevents the water from draining. See more »

  • Sand

    Sand

    Sand, small particles of rock and minerals or other materials, such as coral or slag. See more »

  • Sandstone

    Sandstone

    Sandstone, a porous sedimentary rock composed of grains of sand usually held together by a natural cement, such as lime. See more »

  • Schist

    Schist

    Schist, a common metamorphic rock. Schist consists mainly of silicate minerals, chiefly mica, hornblende, talc, or chlorite. See more »

  • Shale

    Shale

    Shale, the most common type of sedimentary rock. Geologists estimate that between 70 and 83 per cent of the earth's sedimentary rock is shale. See more »

  • Slate

    Slate

    Slate, a common metamorphic rock that splits into thin, even sheets. Slate consists primarily of such minerals as muscovite (mica), chlorite, and quartz. See more »

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