Relating to eclogite, a type of metamorphic rock found deep in the Earth's crust and upper mantle.
From eclogite with the suffix -ic; 'eclogite' comes from Greek 'ekloge' meaning selection, because it's a 'selected' or 'chosen' collection of minerals crystallized under extreme pressure.
Eclogite rocks form so deep underground under such crazy pressure that they're literally created at the conditions of the Earth's mantle—finding them on the surface means ancient ocean floor got shoved way down and back up!
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