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Quartz Monzonite

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Quartz monzonite is a plutonic rock that, like granite, consists of quartz and the two types of feldspar, but has much less quartz than granite. (more below)
Quartz-poor granite
Photo (c) 2008 Andrew Alden, licensed to About.com (fair use policy)
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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