igneous
Rounded quartz-rich pebble
Likely quartzite (metamorphosed quartz sandstone), composition predominantly quartz (SiO₂)
AI-generated identification · may be incorrectPinkish tan, opaque to slightly translucent, dull to vitreous luster, and rounded by abrasion; quartz hardness is 7 Mohs with no cleavage. The photo alone cannot confirm whether it is quartzite or another quartz-rich rock.
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Physical properties
Pinkish tan, opaque to slightly translucent, dull to vitreous luster, and rounded by abrasion; quartz hardness is 7 Mohs with no cleavage. The photo alone cannot confirm whether it is quartzite or another quartz-rich rock.
Formation & geological history
If quartzite, it formed when quartz sandstone was compacted and recrystallized during metamorphism; its age and source cannot be determined from the image. The rounded shape suggests transport and wear in sediment or gravel.
Uses & applications
Quartzite is used as crushed stone, construction aggregate, paving, and decorative stone; attractive pebbles are collected or used in landscaping.
Geological facts
Quartz-rich rocks resist weathering, so they can persist as rounded pebbles in gravel deposits.
Field identification & locations
Look for a hard surface that scratches glass and grains fused into a cohesive rock; quartzite commonly occurs in river gravels and glacial deposits. This specimen’s exact identity is uncertain from appearance alone.
