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countable and uncountable, plural eclogites
(petrology) A coarse-grained metamorphic rock, a mixture of pyroxene, quartz, and feldspar with inclusions of red garnet. quotations
Assiduoud field-workers have discovered little pods of a rock called eclogite in the rocks around San Bernardino.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 101