igneous
Coarse-grained granite or granodiorite
Granitoid; primarily quartz, feldspar, and biotite/hornblende
AI-generated identification · may be incorrectMedium–coarse granular texture with gray, white, and dark minerals; typically Mohs 6–7, vitreous quartz luster, blocky feldspar cleavage, and no foliation. The image is insufficient to distinguish granite from closely related granodiorite confidently.
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Physical properties
Medium–coarse granular texture with gray, white, and dark minerals; typically Mohs 6–7, vitreous quartz luster, blocky feldspar cleavage, and no foliation. The image is insufficient to distinguish granite from closely related granodiorite confidently.
Formation & geological history
A plutonic igneous rock formed when silica-rich magma cooled slowly deep underground, allowing visible crystals to grow; commonly Precambrian to Phanerozoic in age depending on locality.
Uses & applications
Widely used as dimension stone, countertops, monuments, building cladding, road aggregate, and landscaping stone; attractive pieces may be collected as representative rock specimens.
Geological facts
Quartz appears translucent gray, feldspar is white or pale, and biotite or hornblende forms black grains. A fresh broken surface is generally more diagnostic than a weathered exterior.
Field identification & locations
Common worldwide in continental mountain belts and exposed plutons, including the Sierra Nevada, Appalachian region, Canadian Shield, and Scandinavian Shield. Identify it by interlocking visible crystals and a scratch resistance greater than glass; acid testing and thin-section analysis can refine the name.
