Eclogite rock sample

Eclogite rock sample

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Credit: JEAN-CLAUDE REVY, ISM/SCIENCE PHOTO LIBRARY

Caption: Eclogite rock sample. This is a metamorphic rock, formed when heat and pressure in the Earth's crust alter the structure of existing rocks. Eclognite forms under relatively high pressures (ultra-high pressure metamorphism) and is a very dense rock. It is thought to help drive the convection currents found in the Earth's mantle. This rock normally forms from basalt or gabbro, heated up and compressed in a subduction zone, a region where the Earth's crust descends into the mantle. A wide range of minerals are found in eclogite samples, but the most common is garnet. The round, red-grey areas in this rock are garnet stones.

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Keywords: 1, crustal, cut out, cut-out, dense, earth science, eclogite, garnet, garnets, geological, geology, inclusion, inclusions, metamorphic, mineral, mineralogy, one, precious stone, rock, rocks, sample, single, stones, subduction zone, uhp metamorphism, ultra-high pressure

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