metamorphic
Quartzite Pebble
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, colors ranging from yellowish-brown, tan, to white due to iron oxide staining, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, and specific gravity of approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from yellowish-brown, tan, to white due to iron oxide staining, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, and specific gravity of approximately 2.65.
Formation & geological history
Formed from quartz-rich sandstone or chert that has been subjected to high heat and pressure during regional metamorphism, typically occurring over millions of years in orogenic belts.
Uses & applications
Used in construction, as road aggregate, railway ballast, and decorative landscaping stone due to its exceptional durability and resistance to weathering.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why quartz-rich rocks often survive long transportation in rivers and streams to become smooth, rounded pebbles.
Field identification & locations
Can be identified in the field by its high hardness (it will easily scratch glass and cannot be scratched by a steel knife) and lack of reactivity to acid. Common in riverbeds, beaches, and glacial till worldwide.
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