igneous
Rounded granite pebble
Granite, chiefly quartz, feldspar, and mica/amphibole
AI-generated identification · may be incorrectCoarse-grained, speckled white-gray rock with black mineral grains; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a whole. The smooth, oval shape indicates natural water abrasion or tumbling.
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Physical properties
Coarse-grained, speckled white-gray rock with black mineral grains; typically Mohs 6–7, vitreous to dull luster, interlocking crystals, and no prominent cleavage as a whole. The smooth, oval shape indicates natural water abrasion or tumbling.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma, commonly during Precambrian to younger continental pluton formation; this specimen was later weathered and rounded in a stream, beach, or gravel deposit.
Uses & applications
Used extensively as crushed aggregate, building stone, countertops, monuments, and landscaping; this small pebble has primarily educational or decorative value.
Geological facts
The white material is likely feldspar and quartz, while black flecks may be biotite, hornblende, or magnetite. Exact identification would require a fresh surface and mineral or thin-section testing.
Field identification & locations
Identify granite by its visible interlocking light and dark grains, hardness, and resistance to scratching; common worldwide, especially in continental mountain belts and glacial deposits. It should not fizz with dilute acid.
