igneous
Likely weathered granite
Granite, a quartz–feldspar-rich intrusive igneous rock
AI-generated identification · may be incorrectPale tan-gray, rough and granular with visible light mineral grains and little luster; likely quartz (Mohs 7), feldspars (6), and minor mica (2–3). Granite has an interlocking crystalline texture and no regular cleavage as a whole; exact identification is limited by the image.
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Physical properties
Pale tan-gray, rough and granular with visible light mineral grains and little luster; likely quartz (Mohs 7), feldspars (6), and minor mica (2–3). Granite has an interlocking crystalline texture and no regular cleavage as a whole; exact identification is limited by the image.
Formation & geological history
Forms when silica-rich magma cools slowly underground, commonly in continental crust; individual granite bodies may be Precambrian to recent in geological age. The specimen’s age and locality cannot be determined from appearance alone.
Uses & applications
Granite is widely used as building and paving stone, countertops, monuments, and crushed aggregate; ordinary hand specimens have little commercial value.
Geological facts
Granite’s coarse grains reflect slow cooling at depth; weathering can roughen and lighten its surface.
Field identification & locations
Look for interlocking quartz and feldspar grains, often with darker mica; compare with a fresh broken surface because weathering can obscure minerals. Granite occurs worldwide in continental mountain belts and ancient cratons.
