igneous
Rounded quartz-rich pebble
Likely quartzite or quartz-bearing granitoid; predominantly SiO₂ quartz with possible feldspar and mica
AI-generated identification · may be incorrectGray-white, fine-to-medium grained, dull to weakly glassy luster, and rounded/tumbled surfaces. Quartz hardness is about Mohs 7; quartzite is commonly very tough with no cleavage, while granitoid may show feldspar cleavage and mica flakes.
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Physical properties
Gray-white, fine-to-medium grained, dull to weakly glassy luster, and rounded/tumbled surfaces. Quartz hardness is about Mohs 7; quartzite is commonly very tough with no cleavage, while granitoid may show feldspar cleavage and mica flakes.
Formation & geological history
Most likely a naturally weathered stream or glacial pebble derived from metamorphic quartzite or weathered granite; its precise geological age and source cannot be determined from the photograph.
Uses & applications
Common pebbles have negligible commercial value but may be used decoratively, in landscaping, or as educational specimens; attractive quartzite pieces can be collected.
Geological facts
The specimen appears granular and pale, but the image does not resolve diagnostic crystals or layering, so exact identification is uncertain.
Field identification & locations
Test with a steel knife or glass: quartz-rich material should resist scratching glass; inspect with a loupe for interlocking quartz grains, feldspar, or mica. Quartzite is widespread in mountain belts and river gravels worldwide.
