igneous
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and K-feldspar)
Hardness: 6-7 on Mohs scale. Color: Grayish-white to light gray with orange/brown iron oxide weathering. Luster: Dull to phaneritic (visible crystals). Crystal structure: Massive phaneritic grains with a granular texture. Cleavage: Poor (fractures unevenly).
- Hardness
- 6-7 on Mohs scale
- Luster
- Dull to phaneritic (visible crystals)
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Grayish-white to light gray with orange/brown iron oxide weathering. Luster: Dull to phaneritic (visible crystals). Crystal structure: Massive phaneritic grains with a granular texture. Cleavage: Poor (fractures unevenly).
Formation & geological history
Formed through the slow cooling of magma deep beneath the Earth's surface (intrusive). Most common in volcanic arcs and mountain-building regions (subduction zones). It belongs to the Phaneritic Plutonic rock family.
Uses & applications
Commonly used as crushed stone for road construction, landscaping, and building foundations. High-quality slabs can be polished and used for countertops and floor tiles, often sold under the commercial name 'granite'.
Geological facts
Granodiorite is the most common rock type in the continental crust and constitutes the majority of the famous Yosemite National Park batholith. The Rosetta Stone was carved from a slab of granodiorite.
Field identification & locations
Identify in the field by its 'salt and pepper' appearance (mixture of light and dark minerals) where light minerals are dominated by plagioclase rather than orthoclase. Commonly found in mountainous terrains and glacial deposits. This specimen shows significant orange iron-oxide staining common in surface weathering.
