Image of the Week: October 17 - 23, 2004
(September 26 - October 2, 2004 -
Interrupted by Mount St. Helens)
Granite is the characteristic rock of continental crust.
It has a coarse-grained texture
due to slow cooling deep below Earth's surface.
Granite is composed of the following light-colored silicate minerals:
potassium feldspar, quartz, plagioclase feldspar, and muscovite mica.
The dark-colored silicate minerals typical of granite are:
biotite mica, and hornblende.
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LCC Image of the Week 12-03-04