igneous
Granite (small rough fragment)
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectVisible interlocking white, gray, and black grains suggest quartz, feldspar, and dark mica or amphibole. Typical hardness is about 6–7 Mohs; the texture is granular, with no regular cleavage across the rock.
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Physical properties
Visible interlocking white, gray, and black grains suggest quartz, feldspar, and dark mica or amphibole. Typical hardness is about 6–7 Mohs; the texture is granular, with no regular cleavage across the rock.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing crystals to grow. Granite bodies occur in continental crust and span a wide range of geological ages.
Uses & applications
Used as dimension stone, countertops, paving, monuments, and aggregate; attractive pieces may be kept as collection specimens.
Geological facts
Granite’s contrasting speckles come from its different mineral grains, rather than a uniform color or coating.
Field identification & locations
Identify it by its hard, visibly crystalline, salt-and-pepper texture; quartz should resist scratching with a steel knife. Found in many continental mountain regions and exposed plutons; this small, unpolished fragment is not identifiable to a specific locality from appearance alone.
