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  • Rock | Definition, Characteristics, Formation, Cycle, Classification . . .
    Rock, in geology, naturally occurring and coherent aggregate of one or more minerals Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes The three major classes of rock are igneous, sedimentary, and metamorphic rock
  • Mineral | Types Uses | Britannica
    Mineral, naturally occurring homogeneous solid with a definite chemical composition and a highly ordered atomic arrangement Usually formed by inorganic processes, there are several thousand known mineral species, about 100 of which constitute the major mineral components of rocks
  • Sedimentary rock | Definition, Formation, Examples, Characteristics . . .
    The book Rocks and Rock Minerals by Louis V Pirsson was first published in 1908, and it has enjoyed various revisions Sedimentary rocks are classified there rather simplistically according to physical characteristics and composition into detrital and nondetrital rocks
  • Rock - Structure, Texture, Composition | Britannica
    Since rocks are aggregates of mineral grains or crystals, their properties are determined in large part by the properties of their various constituent minerals
  • Igneous rock | Characteristics, Examples, Formation, Types - Britannica
    The great majority of the igneous rocks are composed of silicate minerals (meaning that the basic building blocks for the magmas that formed them are made of silicon [Si] and oxygen [O]), but minor occurrences of carbonate-rich igneous rocks are found as well
  • Geology - Earth Composition, Rocks, Minerals | Britannica
    Geology - Earth Composition, Rocks, Minerals: As a discipline, mineralogy has had close historical ties with geology Minerals as basic constituents of rocks and ore deposits are obviously an integral aspect of geology
  • Metamorphic rock | Definition, Formation, Facts | Britannica
    Minerals within the original rock, or protolith, respond to the changing conditions by reacting with one another to produce a new mineral assemblage that is thermodynamically stable under the new pressure-temperature conditions
  • rock - Students | Britannica Kids | Homework Help
    Most rocks contain several types of minerals; for example, the igneous rock granite is largely composed of the minerals quartz, feldspar, and mica In contrast, pure sandstone, a sedimentary rock, contains only the mineral quartz
  • Igneous rock - Minerals, Magma, Crystals | Britannica
    Igneous rock - Minerals, Magma, Crystals: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron)
  • Rock - Electrical Properties | Britannica
    The magnetic properties of rocks arise from the magnetic properties of the constituent mineral grains and crystals Typically, only a small fraction of the rock consists of magnetic minerals





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