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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