trondhjemite

[tron-ye-mahyt]

noun Petrology.

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

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Origin of trondhjemite

Trondhjem (now Trondheim) + -ite¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018