A high-pressure metamorphic rock formed deep within the Earth, typically composed of garnet and pyroxene minerals, often found in ancient mountain chains.
From Greek 'ekloge' meaning 'selection' or 'choice', because this rock appears to be a carefully selected combination of minerals. The Greek root reflects how rare and distinctive these rocks are.
Eclogite is so rare and exotic that finding it at Earth's surface is like discovering a postcard from the mantle—it proves that old ocean crust got dragged down to the planet's depths and somehow made it back to the surface!
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