Trondjhemite

From Wikipedia, the free encyclopedia

You have new messages (last change).

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

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. Biotite is darker and contains more Fe-Mg-rich minerals.


 This geology article is a stub. You can help Wikipedia by expanding it.
Retrieved from "http://en.wikipedia.org../../../t/r/o/Trondjhemite.html"