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Before metamorphism, serpentinite is a type of ultramafic rock primarily composed of the mineral olivine, which undergoes alteration due to hydrothermal processes. It typically forms from the alteration of peridotite, a rock rich in magnesium and iron. This alteration leads to the formation of serpentinite, characterized by its greenish color and smooth, waxy texture, resulting from the hydration of olivine into serpentine minerals. The process often occurs in environments such as mid-ocean ridges or subduction zones.

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Syenite - Wikipedia, the free encyclopediaSyenite is a coarse-grained intrusive igneous rockof the same general composition as granite but with the quartz either absent or present in relatively small amounts (


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