Click the photo for the full-size version. Quartz monzonite is one of the granitoids, a series of quartz-bearing plutonic rocks that commonly must be taken to the laboratory for a firm identification. See more detail in the discussion of granitoid rocks and in the QAP classification diagram.
This quartz monzonite is part of the Cima Dome in the Mojave Desert of California. The pink mineral is alkali feldspar, the milky white mineral is plagioclase feldspar, and the gray glassy mineral is quartz. The minor black minerals are mostly hornblende and biotite.
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