Serpentinite
Rock formed by hydration and metamorphic transformation of olivine / From Wikipedia, the free encyclopedia
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Serpentinite is a metamorphic rock composed predominantly of one or more serpentine group minerals formed by near to complete serpentinization of mafic to ultramafic rocks. Its name originated from the similarity of the texture of the rock to that of the skin of a snake.[1] Serpentinite has been called serpentine or serpentine rock, particularly in older geological texts and in wider cultural settings.[2][3][4][5][6]
Because most of the chemical reactions necessary to synthesize acetyl-CoA, essential to basic biochemical pathways of life, take place during serpentinization, serpentinite thermal vents are a candidate for the environment in which life on Earth originated.