igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock, typically composed of quartz, potassium feldspar, plagioclase, and mica
AI-generated identification · may be incorrectThe specimen appears gray-green and speckled with a granular texture. Granite minerals are usually Mohs 6–7; quartz has no cleavage, while feldspars show two cleavages near 90°. The exact mineral mix is difficult to confirm from the photo.
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Physical properties
The specimen appears gray-green and speckled with a granular texture. Granite minerals are usually Mohs 6–7; quartz has no cleavage, while feldspars show two cleavages near 90°. The exact mineral mix is difficult to confirm from the photo.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. It occurs in continental crust ranging from Precambrian to recent geological ages.
Uses & applications
Used for building stone, countertops, paving, monuments, and decorative landscaping; this rounded specimen is suitable for collecting or display.
Geological facts
Its interlocking crystals distinguish granite from many layered or glassy rocks. The rounded shape may result from natural weathering and transport, though the photo alone cannot establish its history.
Field identification & locations
Look for visible interlocking quartz and feldspar grains with scattered dark mica, and no layering. Granite is widespread worldwide; a common hand-sized specimen typically sells for about $2–$15.
