This week I decided to head out to Yosemite National Park to get a good look at some igneous rocks, particularly granite rocks. Granite is an intrusive igneous rock. This means that it is formed from magma deep underground. Granite actually contains many different types of minerals such as quartz, feldspar, hornbende, and biotite. The proportions of these minerals can even change the name of the granite. These particular set of minerals will make up something called Granodiorite, which is still granite, just has a different name to show its composition. Fascinating right!? If not, then at the very least they are pretty to look at.
-Matt
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