igneous
Rounded granitic pebble
Granite, chiefly quartz–feldspar–mica; exact variety uncertain from the image
AI-generated identification · may be incorrectLight gray-green, mottled, fine- to medium-grained, with a dull to slightly vitreous luster and no obvious cleavage. Typical granite hardness is about 6–7 Mohs and specific gravity 2.63–2.75; the rounded shape indicates water abrasion or tumbling.
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Physical properties
Light gray-green, mottled, fine- to medium-grained, with a dull to slightly vitreous luster and no obvious cleavage. Typical granite hardness is about 6–7 Mohs and specific gravity 2.63–2.75; the rounded shape indicates water abrasion or tumbling.
Formation & geological history
An intrusive igneous rock crystallized slowly from silica-rich magma, commonly during Precambrian to Phanerozoic continental crust formation. Its present smooth form likely developed in a stream, beach, or glacial environment.
Uses & applications
Granite is widely used for crushed stone, aggregate, paving, countertops, monuments, and building stone; this small pebble has mainly educational or decorative value.
Geological facts
The pale grains are likely quartz and feldspar, while darker flecks may be biotite, amphibole, or alteration minerals. Greenish tones can result from epidote or chlorite, but the image is insufficient for precise identification.
Field identification & locations
Look for interlocking grains, visible quartz, feldspar, and dark minerals; it should not fizz with dilute acid. Common worldwide, especially in eroded granitic terrains and river gravels.
