Granite
(c) 2004 Andrew Alden, licensed to About.com, Inc. (fair use policy)
This granite specimen comes from the Salinian block of central California, a chunk of ancient crust carried up from southern California along the San Andreas fault. Its composition is quartz (gray), plagioclase feldspar (white), alkali feldspar (beige), biotite and hornblende. Pictures of other granite specimens appear in the granite picture gallery. Also see the granite landforms of Joshua Tree National Park. And big closeup pictures of granite are available in the closeup rock wallpaper photos.
Other picture galleries:
Fossils
Geologic Features and Processes
Glaciers and Ice
Landforms
Minerals
Rocks
Geology and Society
