igneous
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectThe small, rounded specimen is tan to cream with dark mineral specks and a dull, granular surface. Granite typically contains quartz, feldspar, and mica; hardness is about 6–7 Mohs, with interlocking crystals and no cleavage as a rock.
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Physical properties
The small, rounded specimen is tan to cream with dark mineral specks and a dull, granular surface. Granite typically contains quartz, feldspar, and mica; hardness is about 6–7 Mohs, with interlocking crystals and no cleavage as a rock.
Formation & geological history
Granite forms when silica-rich magma cools slowly underground, allowing crystals to grow. Its age cannot be determined from the image; granites range from very recent to billions of years old.
Uses & applications
Granite is widely used for building stone, countertops, paving, and monuments; this pebble is mainly suitable for collecting or decoration.
Geological facts
The rounded shape and worn surface suggest transport and abrasion in water or sediment, though the source cannot be confirmed from the photo.
Field identification & locations
Look for a hard, granular mix of light quartz/feldspar and darker minerals; common sources include stream and beach gravels derived from granite outcrops.
