igneous
Granite (likely)
Granite, a quartz–feldspar-rich intrusive igneous rock
AI-generated identification · may be incorrectSmall, rough gray-green specimen with visible light and dark mineral grains. Granite is typically Mohs 6–7, with a granular crystalline texture and no preferred cleavage; exact identification is uncertain from the photo.
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Physical properties
Small, rough gray-green specimen with visible light and dark mineral grains. Granite is typically Mohs 6–7, with a granular crystalline texture and no preferred cleavage; exact identification is uncertain from the photo.
Formation & geological history
Forms when silica-rich magma cools slowly underground, allowing crystals to grow. Granite occurs in crust of many ages, from Archean to recent geological periods.
Uses & applications
Used as building and paving stone, countertops, monuments, and decorative aggregate; this small piece is mainly of educational or collector interest.
Geological facts
Granite commonly contains quartz, feldspar, and mica or amphibole. Its mineral proportions and grain size vary substantially, and this specimen’s greenish color could indicate other minerals or a different rock.
Field identification & locations
Look for interlocking grains, pale feldspar and quartz, and darker mica or amphibole; a close view or hardness tests would help confirm it. Granite is widespread in continental mountain belts and ancient cratons.
