igneous
Granodiorite
Phaneritic Intrusive Igneous Rock
Hardness of 6-7 on the Mohs scale, grayish speckled color (salt and pepper appearance), sub-to-euhedral crystal structure, vitreous to dull luster, specific gravity around 2.7-2.8.
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Physical properties
Hardness of 6-7 on the Mohs scale, grayish speckled color (salt and pepper appearance), sub-to-euhedral crystal structure, vitreous to dull luster, specific gravity around 2.7-2.8.
Formation & geological history
Formed from the slow cooling of magma beneath the Earth's crust, typically found in continental arcs and mountain-building zones.
Uses & applications
Used in construction, as dimension stone, crushed stone for road bases, and decorative landscaping.
Geological facts
Granodiorite is chemically intermediate between granite and diorite. It is very common in the batholiths of western North America, including Southern California.
Field identification & locations
Easily identified by its intermediate gray color with distinct white feldspar and dark biotite or hornblende crystals. Common in Southern California geological formations.
