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Peridotite is a coarse grained igneous rock which forms in the earth's mantle. It is the dominant and most common rock of the earth's mantle. Its high concentrations of Olivine and pyroxene contribute to its unique characteristics. The Olivine gives it a high magnesium concentration as well as an generous amount of iron. Peridotite itself belongs to the Amphibole group. It contains less then 54% silica making it an ultramafic rock, and therefore is made up of dark minerals with intense concentrations of magnesium and iron. There can be different Chemical Compositions with different Ratio's of Iron to magnesium, or Fe/Mg.

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  • Peridotite
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  • Peridotite is a coarse grained igneous rock which forms in the earth's mantle. It is the dominant and most common rock of the earth's mantle. Its high concentrations of Olivine and pyroxene contribute to its unique characteristics. The Olivine gives it a high magnesium concentration as well as an generous amount of iron. Peridotite itself belongs to the Amphibole group. It contains less then 54% silica making it an ultramafic rock, and therefore is made up of dark minerals with intense concentrations of magnesium and iron. There can be different Chemical Compositions with different Ratio's of Iron to magnesium, or Fe/Mg.
  • Peridotite is derived either as solid blocks and fragments, or as crystals accumulated from magmas that formed in the mantle. The compositions of peridotites from these layered igneous complexes vary widely, reflecting the relative proportions of pyroxenes, chromite, plagioclase, and amphibole. The compositions of peridotite nodules preserve isotope ratios of osmium and other elements that record processes over three billion years ago, and so they are of special interest to paleogeologists because they provide clues to the composition of the early mantle and the complexities of the processes that were involved.
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abstract
  • Peridotite is a coarse grained igneous rock which forms in the earth's mantle. It is the dominant and most common rock of the earth's mantle. Its high concentrations of Olivine and pyroxene contribute to its unique characteristics. The Olivine gives it a high magnesium concentration as well as an generous amount of iron. Peridotite itself belongs to the Amphibole group. It contains less then 54% silica making it an ultramafic rock, and therefore is made up of dark minerals with intense concentrations of magnesium and iron. There can be different Chemical Compositions with different Ratio's of Iron to magnesium, or Fe/Mg.
  • Peridotite is derived either as solid blocks and fragments, or as crystals accumulated from magmas that formed in the mantle. The compositions of peridotites from these layered igneous complexes vary widely, reflecting the relative proportions of pyroxenes, chromite, plagioclase, and amphibole. The compositions of peridotite nodules preserve isotope ratios of osmium and other elements that record processes over three billion years ago, and so they are of special interest to paleogeologists because they provide clues to the composition of the early mantle and the complexities of the processes that were involved. The word peridotite comes from the gemstone peridot, which consists of pale green olivine.
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