igneous
Granite fragment (likely)
Granite; primarily quartz (SiO₂), feldspar, and mica
AI-generated identification · may be incorrectSmall, irregular gray-and-white fragment with a granular crystalline texture and likely vitreous to dull luster. Typical granite hardness is about 6–7 Mohs, with no prominent cleavage as a whole rock; exact properties are uncertain from the image.
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Physical properties
Small, irregular gray-and-white fragment with a granular crystalline texture and likely vitreous to dull luster. Typical granite hardness is about 6–7 Mohs, with no prominent cleavage as a whole rock; exact properties are uncertain from the image.
Formation & geological history
Granite forms when silica-rich magma slowly cools deep within continental crust, producing interlocking crystals; specimens may range from Precambrian to recent geological ages. Commonly exposed by uplift and erosion.
Uses & applications
Used extensively as dimension stone, countertops, monuments, paving, aggregate, and landscaping material; small fragments have minimal commercial value.
Geological facts
The apparent mottled texture suggests contrasting light feldspar/quartz and darker mica or amphibole grains. A hand lens would help distinguish granite from similar gneiss or quartz-rich rock.
Field identification & locations
Common worldwide, especially in continental mountain belts and shields. Look for visible interlocking crystals and test a fresh surface: quartz scratches glass, while granite generally does not fizz with dilute acid.
