igneous
Granite (granitoid pebble)
Felsic intrusive igneous rock, chiefly quartz and feldspar with dark biotite or amphibole
AI-generated identification · may be incorrectFine- to medium-grained, speckled white-gray with black minerals; interlocking crystals, typically Mohs 6–7 and no cleavage as a whole rock. The small specimen’s exact mineral proportions and texture are difficult to confirm from the image.
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Physical properties
Fine- to medium-grained, speckled white-gray with black minerals; interlocking crystals, typically Mohs 6–7 and no cleavage as a whole rock. The small specimen’s exact mineral proportions and texture are difficult to confirm from the image.
Formation & geological history
Likely cooled slowly from silica-rich magma underground, allowing crystals to grow; granites form across many geological ages in continental crust.
Uses & applications
Granite is widely used for building stone, paving, countertops, monuments, and decorative aggregate; this tiny pebble is mainly a reference or collection specimen.
Geological facts
The visible black-and-white speckling is characteristic of intergrown light feldspar/quartz and darker minerals.
Field identification & locations
Look for a hard, granular texture with distinct pale and dark grains; common in continental mountain belts and glacial or stream deposits. A photo alone cannot distinguish granite from some related granitoid rocks.
