metamorphic
Quartzite pebble
Quartzite (mostly SiO2)
AI-generated identification · may be incorrectHardness 7, whitish to light gray with yellowish/greenish staining, dull to somewhat waxy luster when wet, crystalline texture obscured by weathering and rounding
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Physical properties
Hardness 7, whitish to light gray with yellowish/greenish staining, dull to somewhat waxy luster when wet, crystalline texture obscured by weathering and rounding
Formation & geological history
Formed from sandstone subjected to heat and pressure, then weathered and rounded by water transport (river or beach environment).
Uses & applications
Commonly used in landscaping, as aggregate, and sometimes in rock tumbling.
Geological facts
Quartzite is extremely durable, which is why it often survives long transport in rivers to form well-rounded pebbles like this one.
Field identification & locations
Identified by its hardness (will scratch glass), granular but fused texture, and lack of cleavage. Very common in riverbeds and glacial deposits.
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