igneous
Granodiorite
Granodiorite
Hardness: 6-7 (Mohs scale); Color: Salt and pepper (mottled grey, white, and black); Luster: Phaneritic (crystalline); Crystal Structure: Granular/interlocking; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 (Mohs scale)
- Color
- Salt and pepper (mottled grey, white, and black)
- Luster
- Phaneritic (crystalline)
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Salt and pepper (mottled grey, white, and black); Luster: Phaneritic (crystalline); Crystal Structure: Granular/interlocking; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the slow cooling of silica-rich magma beneath the Earth's surface (intrusive). They comprise major portions of continental batholiths.
Uses & applications
Used in construction as crushed stone for road base, building facades, ornamental stone, and as paving material.
Geological facts
Granodiorite is the intermediate rock between granite and diorite. A famous example of granodiorite is the Rosetta Stone.
Field identification & locations
Identify by its 'salt and pepper' appearance with more plagioclase feldspar than orthoclase. Commonly found in mountain ranges like the Sierra Nevada.
