metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica and feldspar
AI-generated identification · may be incorrectTypically Mohs 7, gray to white, with a vitreous to sugary luster and interlocking quartz grains; cleavage is absent, and fracture is irregular to conchoidal. The specimen appears foliated or layered, so it could include mica-rich schist.
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Physical properties
Typically Mohs 7, gray to white, with a vitreous to sugary luster and interlocking quartz grains; cleavage is absent, and fracture is irregular to conchoidal. The specimen appears foliated or layered, so it could include mica-rich schist.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure during regional metamorphism, commonly during mountain building; its exact age cannot be determined from the image.
Uses & applications
Used as durable building stone, aggregate, paving, and landscaping rock; attractive pieces may be collected, but this example appears ordinary rather than gem grade.
Geological facts
Quartzite is commonly harder and more resistant to weathering than its sandstone precursor, often forming ridges and resistant boulders.
Field identification & locations
Look for quartz grains fused together so the rock breaks across grains rather than around them; a steel knife should not scratch fresh quartzite, while glass can be scratched. Common in metamorphic mountain belts worldwide.
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