metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, greenish-gray color, vitreous luster, non-foliated massive crystal structure, and specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, greenish-gray color, vitreous luster, non-foliated massive crystal structure, and specific gravity around 2.65.
Formation & geological history
Formed through the thermal or regional metamorphism of quartz-rich sandstone under intense heat and pressure over millions of years.
Uses & applications
Used primarily in landscaping, construction aggregate, and occasionally as decorative stone or for raw material in glassmaking.
Geological facts
Quartzite is exceptionally resistant to weathering, which explains why quartz pebbles survive tumbling in riverbeds and beaches for long periods.
Field identification & locations
Identified by its high hardness that easily scratches glass and its lack of reaction to acid. Found globally in ancient mountain belts and river gravels.
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