different between pyroxene vs eclogite

English

From French pyroxène, from pyro- + Ancient Greek ????? (xénos, “stranger”).

pyroxene (plural pyroxenes)

(mineralogy) Any of a group of crystalline minerals containing silicates of iron, magnesium and calcium.
- 2004, Richard Fortey, The Earth, Folio Society 2011, p. 10:
  By the pathside, there are occasional large boulders that shown black crystals the size of a fingernail; these are pyroxene minerals that had time to crystallise out deep within the chamber of liquid rock – or magma – beneath the volcano.

Ancient Greek ?????? (eklog?, “selection”), +? -ite.

eclogite (countable and uncountable, plural eclogites)

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

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