igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectPale gray with visible interlocking light and dark grains; typically quartz, feldspar, and mica. Hardness about 6–7 Mohs; crystalline, granular texture, with no distinct cleavage as a whole rock.
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Physical properties
Pale gray with visible interlocking light and dark grains; typically quartz, feldspar, and mica. Hardness about 6–7 Mohs; crystalline, granular texture, with no distinct cleavage as a whole rock.
Formation & geological history
Formed when silica-rich magma cooled slowly underground, allowing crystals to grow. Granite bodies form across many geological ages; the image does not reveal a specific age or source.
Uses & applications
Granite is widely used as building and paving stone, countertops, and decorative aggregate; this small rounded specimen is mainly suitable for collecting.
Geological facts
The speckled appearance comes from contrasting mineral grains, commonly light quartz and feldspar with dark biotite or amphibole.
Field identification & locations
Look for a hard, visibly granular rock with interlocking crystals and no layering; quartz should resist scratching by a steel knife. Granite occurs worldwide, but its exact origin cannot be determined from the photo.
