metamorphic
Quartzite Pebble
Metamorphic Quartz-rich Rock
Hardness of 7 on the Mohs scale, variable color including purple and white, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, variable color including purple and white, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the regional or contact metamorphism of quartz-rich sandstone under high heat and pressure conditions over millions of years.
Uses & applications
Used in landscaping, construction aggregate, and as a decorative stone or for lapidary work.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why it often survives as smooth pebbles in riverbeds and beaches.
Field identification & locations
Identified by its high hardness (scratches glass), lack of reaction to acid, and sugary texture on fractured surfaces. Commonly found in riverbeds, glacial tills, and ancient sedimentary basins worldwide.
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