
1) Metamorphic rock
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https://www.crosswordclues.com/clue/eclogite

Eclogite t is a mafic (basaltic in composition) metamorphic rock; `mafic eclogite` is redundant. Eclogite is of special interest for at least two reasons. First, it forms at pressures greater than those typical of the crust of the Earth. Second, being an unusually dense rock, eclogite can play an important role in driving convection within the s.....
Found on
http://en.wikipedia.org/wiki/Eclogite

• (n.) A rock consisting of granular red garnet, light green smaragdite, and common hornblende; -- so called in reference to its beauty.
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http://thinkexist.com/dictionary/meaning/eclogite/

any member of a small group of igneous and metamorphic rocks whose composition is similar to that of basalt. Eclogites consist primarily of green ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/e/8

An extremely high-pressure metamorphic rock containing garnet and pyroxene.
Found on
http://www.encyclo.co.uk/local/22392
Ec'lo·gite noun [ See
Ecloque .]
(Min.) A rock consisting of granular red garnet, light green smaragdite, and common hornblende; -- so called in reference to its beauty.
Found on
http://www.encyclo.co.uk/webster/E/6

Eclogite is a rock which consists of pale-green augite, pale-green hornblende, pink garnet with sometimes also quartz, feldspar, cyanite, bronzite, iron ores and rutile. Such rocks occur in regions of xrystalline schists, as the Alps, and are believed to be of intrusive origin in some cases.
Found on
http://www.probertencyclopaedia.com/browse/HE.HTM

An extremely high-pressure metamorphic rock containing garnet and pyroxene.
Found on
http://www.scientificpsychic.com/etc/geology-glossary.html
No exact match found.