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quartz diorite - hand/display specimen of a spectacular subduction-related igneous rock

$ 7.50

Quartz diorite is intermediate between gabbro and granite and is often associated with subduction and the emplacement of subduction-related batholiths. It has a composition similar to the andesite of volcanic arcs. 

Commonly speckled black and white, quartz diorite is a member of a group of plagioclase feldspar-rich plutonic rocks, ranging from diorite with less than 5% quartz, to quartz diorite with 5% to 20% quartz to tonalite with over 20% quartz. The black mineral in this quartz diorite is biotite. The quartz diorite was emplaced in Late Jurassic as part of the Sierra Nevada batholith. These specimens were collected on the west side of the batholith, just upstream from the mouth of the Kern River gorge. When we showed it to other geologists, the first comment was, "What a pretty rock." It is a pretty rock. Click and click again to enlarge the QAPF diagram. See how this rock fits into the classification of intrusive igneous rocks.

 

 

Select a specimen: You can select a specimen by telling us what is in the photo with it, a blue or black and silver pen, a black mechanical pencil or one of those plus some number of coins, or you can let us make the selection.

These specimens ship in a Regional Priority Mail box and can be combined in that box with other purchases. These are slightly larger or thicker than our normal hand specimens, but if space in your cabinet is not an issue, any of these would make a good hand specimen. Shipping becomes economical when other specimens are shipped in the same box for no additional postage. 

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