metamorphic
Quartzite Pebble
Metamorphic Quartzite
AI-generated identification · may be incorrectMohs hardness of 7; vitreous to dull luster; massive crystal structure; white, gray, or pinkish color; conchoidal fracture.
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Physical properties
Mohs hardness of 7; vitreous to dull luster; massive crystal structure; white, gray, or pinkish color; conchoidal fracture.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure during regional metamorphism.
Uses & applications
Used in construction, as railroad ballast, and for manufacturing silica brick and glass.
Geological facts
Extremely resistant to weathering and chemical attack, which is why quartz-rich rocks survive long transportation as pebbles.
Field identification & locations
Identified by its inability to be scratched by steel and lack of fizzing with acid; common in riverbeds and glacial tills.
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