Trondjhemite

Trondjhemite is a leucocratic igneous rock consisting of quartz, oligoclase, and biotite. Trondjhemite is a medium- to coarse-grained rock.

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The term trondjhemite is used for a tonalite in which the dark colored minerals constitute less than 10% of the rock. In general, the more silica-rich rocks are lighter in color due to the abundance of the lighter-colored minerals quartz, K-feldspar, and plagioclase feldspar.