Hand samples of intrusive igneous rock.

From left to right, these rocks are arranged in order of decreasing silica content: granite, diorite, and gabbro.

Click here to see a photo of volcanic rock samples: rhyolite, andesite, basalt.

On to Granodiorite of Mt. Whitney.
Back to pegmatite dike and chilled margin.

Back to Igneous Rock Photos
Back to Geology Pictures