igneous
Weathered granitic pebble
Granite, chiefly quartz, feldspar, and mica
AI-generated identification · may be incorrectLight cream-gray, fine-to-medium grained, with dark mineral speckles and a dull-to-slightly vitreous luster; typical hardness is about 6–7 Mohs. The rounded shape indicates natural abrasion; individual crystals are poorly visible at this scale.
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Physical properties
Light cream-gray, fine-to-medium grained, with dark mineral speckles and a dull-to-slightly vitreous luster; typical hardness is about 6–7 Mohs. The rounded shape indicates natural abrasion; individual crystals are poorly visible at this scale.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. This pebble was likely released by weathering and rounded in a stream, beach, or glacial deposit.
Uses & applications
Granite is widely used as crushed aggregate, building stone, countertops, monuments, and paving; small pebbles have mainly educational or decorative value.
Geological facts
Quartz and feldspar give granite its pale color, while biotite or amphibole create dark flecks. A hand lens and acid-free hardness tests help distinguish it from pale limestone.
Field identification & locations
Common worldwide, especially in exposed continental shields and mountain belts. Look for interlocking crystals, hardness, and lack of fizz with dilute hydrochloric acid; precise identification is limited by the image.
