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trondhjemite

[ tron-ye-mahyt ]

noun

, Petrology.
  1. a coarse-grained igneous rock composed of quartz, plagioclase feldspar, and a small amount of biotite.


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Word History and Origins

Origin of trondhjemite1

Trondhjem (now Trondheim ) + -ite 1

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Trondheim Fiordtrone