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All rocks are composed of minerals, and mineral content plays
a major role in the classification systems used to describe and name them.
White Tank Granite has three prominent minerals that are prominent to
many types of
rocks. If you look closely at the rocks exposed in
this area, you will see a clear grey, glassy material
known as quartz, a milky white mineral called feldspar, and a flaky
black material called biotite. Don't let the rusty mineral confuse you.
This is simply material from minerals that have decomposed from exposure to
the environment. In the past, geologists have called this rock by other
names, including White Tank Monzonite and White Tank Monzogranite.
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