igneous
Rounded speckled granite pebble
Granite, a coarse-grained felsic intrusive igneous rock, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectTan-pink feldspar and dark biotite/hornblende grains create a speckled pattern. Typical hardness is about 6–7 Mohs; it has a granular texture, vitreous quartz, and no consistent cleavage as a whole rock.
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Physical properties
Tan-pink feldspar and dark biotite/hornblende grains create a speckled pattern. Typical hardness is about 6–7 Mohs; it has a granular texture, vitreous quartz, and no consistent cleavage as a whole rock.
Formation & geological history
Formed as silica-rich magma cooled slowly deep in the crust, allowing visible crystals to grow. Its age cannot be determined from the image; granite ranges from Precambrian to geologically recent.
Uses & applications
Granite is used for building stone, countertops, paving, and monuments; this small rounded pebble is mainly suitable for collecting or decoration.
Geological facts
The pebble’s smooth, rounded shape likely resulted from abrasion during transport by water or ice.
Field identification & locations
Look for interlocking light feldspar/quartz grains and scattered dark minerals; unlike layered rocks, granite has no foliation. Granite occurs widely in continental crust worldwide.
