Igneous
Granodiorite / Granite (Weathered)
Granodiorite
Hardness: 6-7 (Mohs scale), Color: Gray, white, black mottled, Luster: Dull to sub-vitreous (due to weathering), Crystal structure: Phaneritic (coarse-grained)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Gray, white, black mottled, Luster: Dull to sub-vitreous (due to weathering), Crystal structure: Phaneritic (coarse-grained)
Formation & geological history
Formed from the slow cooling of magma deep underground (intrusive igneous). Exposed at the surface through uplift and erosion. Common in continental crust.
Uses & applications
Used in construction as a building material, aggregate, or decorative stone. Also used for countertops and monuments.
Geological facts
Granodiorite is similar to granite but contains more plagioclase feldspar than orthoclase feldspar. The famous Rosetta Stone is made of granodiorite.
Field identification & locations
Identified by its speckled appearance of light (quartz, feldspar) and dark (biotite, hornblende) minerals. Found in large plutons or batholiths.
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