igneous
Weathered granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectVisible interlocking grains of pale quartz and feldspar with dark mica or amphibole; orange-brown staining likely iron oxides. Typically Mohs 6–7, nonmetallic luster, with no preferred cleavage at the rock scale.
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Physical properties
Visible interlocking grains of pale quartz and feldspar with dark mica or amphibole; orange-brown staining likely iron oxides. Typically Mohs 6–7, nonmetallic luster, with no preferred cleavage at the rock scale.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing crystals to grow; the pebble was later weathered and rounded by transport. Granite bodies occur across many geological ages.
Uses & applications
Commonly used as building and paving stone, aggregate, and landscaping material; attractive pebbles are also collected or used decoratively.
Geological facts
The speckled appearance comes from multiple minerals crystallizing together, rather than from a single mineral.
Field identification & locations
Look for interlocking, visible light and dark grains and distinguishable quartz, which lacks cleavage. Granite is widespread; this small, ordinary rounded specimen is likely worth about $0–$5 USD.
