igneous
Granodiorite
Granodiorite (Intermediate plutonic rock)
Hardness: 6-7 on Mohs scale; Color: Phaneritic texture with white, gray, and dark minerals (salt and pepper appearance); Luster: Vitreous to dull; Crystal structure: Coarse-grained phaneritic; Cleavage: Good in plagioclase grains; Specific gravity: 2.6-2.7.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Phaneritic texture with white, gray, and dark minerals (salt and pepper appearance); Luster: Vitreous to dull; Crystal structure: Coarse-grained phaneritic; Cleavage: Good in plagioclase grains; Specific gravity: 2.6-2.7.
Formation & geological history
Formed through the slow cooling of silica-rich magma beneath the Earth's surface (intrusive). Often associated with subduction zones and batholiths. Ages vary by location, often appearing in Precambrian to Mesozoic formations.
Uses & applications
Used primarily as crushed stone for road construction and as dimension stone for architectural facades, countertops, and monuments.
Geological facts
Granodiorite is the intermediate rock between granite and diorite. Famous monuments like the Rosetta Stone were carved from a specific type of dark granodiorite.
Field identification & locations
Identify in the field by its coarse crystalline texture and a higher concentration of plagioclase feldspar compared to orthoclase. Commonly found in large mountain ranges like the Sierra Nevada or as glacial erratics and river cobbles.
