igneous
Rounded granite pebble
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectLight gray, fine-to-medium grained, granular texture with dark mineral specks; typically Mohs 6–7, vitreous-to-dull luster, no prominent cleavage as a whole, and specific gravity about 2.6–2.7.
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Physical properties
Light gray, fine-to-medium grained, granular texture with dark mineral specks; typically Mohs 6–7, vitreous-to-dull luster, no prominent cleavage as a whole, and specific gravity about 2.6–2.7.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep within continental crust, commonly during Precambrian to Phanerozoic mountain-building events; this pebble was rounded by stream, beach, or glacial transport.
Uses & applications
Used extensively as building stone, countertops, monuments, aggregate, and landscaping rock; this small specimen has mainly educational or decorative value.
Geological facts
The interlocking texture reflects slow underground cooling, while its rounded shape indicates substantial erosion and transport. Dark flecks are likely biotite or amphibole.
Field identification & locations
Identify it by its visible interlocking quartz-feldspar grains, pale gray color, and scattered black minerals; common sources include continental shield regions and granitic mountain belts worldwide.
