igneous
Granite (likely), hand-sized rough specimen
Granite; a coarse-grained rock composed chiefly of quartz, feldspar, and dark mica or amphibole
AI-generated identification · may be incorrectMottled white, gray, and dark green-black, with a granular, crystalline texture and no obvious layering. Typical granite minerals have Mohs hardness around 6–7 (quartz) and 6 (feldspar); the exact mineral proportions and properties cannot be confirmed from the photo.
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Physical properties
Mottled white, gray, and dark green-black, with a granular, crystalline texture and no obvious layering. Typical granite minerals have Mohs hardness around 6–7 (quartz) and 6 (feldspar); the exact mineral proportions and properties cannot be confirmed from the photo.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing visible crystals to grow. Its age depends on its source; granites occur in continental crust from many geological periods.
Uses & applications
Used widely as building and paving stone, countertops, monuments, and decorative aggregate; rough hand specimens are also collected.
Geological facts
The pale grains are consistent with quartz and feldspar, while the dark patches may be mica or amphibole. The photo does not show enough detail to distinguish granite confidently from similar coarse-grained rocks such as diorite.
Field identification & locations
Look for interlocking visible crystals, abundant pale feldspar/quartz, and scattered dark minerals; a fresh surface and close-up help with identification. Granite is common in continental mountain belts and exposed plutons worldwide.
