metamorphic

Quartz-rich rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

AI-generated identification · may be incorrect

Pale tan to cream, granular and sparkly; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure. The image alone cannot confirm quartzite versus another quartz-rich rock.

Identified October 6, 2026More metamorphic →

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Physical properties

Pale tan to cream, granular and sparkly; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure. The image alone cannot confirm quartzite versus another quartz-rich rock.

Formation & geological history

Quartzite forms when quartz sandstone is recrystallized by heat and pressure, welding quartz grains together; its age depends on the source rock and metamorphic event.

Uses & applications

Used as building and decorative stone, aggregate, and sometimes for carving or collecting.

Geological facts

Quartzite is typically much harder and more resistant to weathering than its sandstone precursor.

Field identification & locations

Look for interlocking quartz grains and a hard surface that scratches glass; quartzite often breaks through grains rather than around them. Found in metamorphic belts worldwide.