igneous
Rounded granitic pebble
Granite, mainly quartz, feldspar, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, speckled gray-brown, with a dull to slightly sparkling luster; individual grains are interlocking and show no obvious cleavage. Hardness is approximately 6–7 Mohs; density is about 2.6–2.8 g/cm³.
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Physical properties
Coarse-grained, speckled gray-brown, with a dull to slightly sparkling luster; individual grains are interlocking and show no obvious cleavage. Hardness is approximately 6–7 Mohs; density is about 2.6–2.8 g/cm³.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in the crust, commonly during Precambrian to younger continental mountain-building events. This specimen was likely rounded by stream or beach transport and surface weathering.
Uses & applications
Granite is widely used as dimension stone, countertops, monuments, aggregate, and landscaping material; this small pebble has mainly educational or modest collecting value.
Geological facts
The granular texture indicates intrusive igneous origin, while its smooth shape is secondary transport wear. Brown-orange patches likely represent iron-oxide weathering of biotite or other ferromagnesian minerals.
Field identification & locations
Identify it by visible quartz and feldspar grains, salt-and-pepper coloration, and hardness sufficient to scratch glass. Common worldwide, especially in regions underlain by continental crust.
