metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, color typically brown, tan, or reddish-brown due to iron oxide staining, luster ranges from vitreous to dull on weathered surfaces, massive or granular crystal structure with no notable cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, color typically brown, tan, or reddish-brown due to iron oxide staining, luster ranges from vitreous to dull on weathered surfaces, massive or granular crystal structure with no notable cleavage.
Formation & geological history
Formed from quartz-rich sandstone or chert that has been subjected to intense heat and pressure (metamorphism), typically during tectonic mountain-building events over millions of years.
Uses & applications
Used in landscaping, construction aggregate, crushed stone for road bases, and occasionally in decorative masonry.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why quartz-rich rocks often survive as rounded pebbles in rivers and beaches long after other rock types have broken down.
Field identification & locations
Can be identified in the field by its high hardness (it will easily scratch glass and cannot be scratched by a knife), its sugary textured freshly broken surface, and lack of reaction to acid.
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