These photographs are of crystalline rocks, which are composed of crystals that grew together in an interlocking manner, like when a magma cools and solidifies. The bottom photograph is of a rock that is too fine to tell, without a microscope, whether it is composed of clasts or crystals.

Click on a small photo to the left to bring up a larger version.

	Finely crystalline rocks (granite) cut by dikes of coarsely crystalline rock (granitic pegmatite), Santa Catalina Mountains, Arizona
	Coarsely crystalline rock (granite), Kitt Peak, Arizona
	Coarsely crystalline rock (granite) containing a dark inclusion of older finely crystalline rock, Harquahala Mountains, Arizona
	Medium-crystalline rock (granodiorite) containing a dark inclusion of older, finely crystalline rock, Granite Wash Mountains, Arizona
	Coarse crystals in a finely crystalline to glassy matrix, Ajo, Arizona
	Very finely crystalline to glassy (too fine to tell) rock (basalt with holes or vesicles) from a volcanic eruption in 1057 AD, Sunset Crater, Arizona