metamorphic
Quartz-rich rock, likely iron-stained quartzite
Quartzite, composed predominantly of quartz (SiO₂), with iron-oxide staining
AI-generated identification · may be incorrectPale gray to cream with rusty-brown patches; granular, uneven fracture and generally vitreous to dull luster. Quartz hardness is 7 Mohs; quartz grains have no cleavage. Exact texture and composition cannot be confirmed from the photo alone.
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Physical properties
Pale gray to cream with rusty-brown patches; granular, uneven fracture and generally vitreous to dull luster. Quartz hardness is 7 Mohs; quartz grains have no cleavage. Exact texture and composition cannot be confirmed from the photo alone.
Formation & geological history
Quartz sandstone recrystallized under heat and pressure into interlocking quartz grains; this process occurs during regional or contact metamorphism. The specimen’s geological age and locality are not determinable from the image.
Uses & applications
Quartzite is used as crushed stone, road aggregate, building stone, and sometimes as decorative or lapidary material.
Geological facts
Iron oxides commonly produce rusty colors in quartz-rich rocks. Quartzite is typically hard enough to scratch glass and resists weathering.
Field identification & locations
Look for a hard, quartz-rich texture and fractures that cut across grains rather than grains separating cleanly; a fresh surface or acid-free hardness test can help distinguish it from sandstone. Quartzite occurs worldwide in metamorphic terrains.
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