Rock formed by a great intrusion of molten (igneous) material, in the Earth's crust.  Technically speaking, it contains at least twice as much plagioclase as orthoclase (both minerals are types of feldspar), as well as minor accessory minerals, and is coarse-grained.
   Non-geologists would look at it and call it granite, which it very much resembles.  Around the Phoenix area, it is more of a grayish color, whereas the real granite is more pinkish or brownish.

Granodiorite, showing "stretched" fabric,
from the South Mountains, in Phoenix, Arizona.
This image is of a polished section, about 4 cm across.


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