metamorphic
Quartz-rich metamorphic rock (likely quartzite)
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectMostly white to silvery gray with brown staining and a vitreous-to-dull luster; quartz hardness is 7 Mohs. The coarse, irregular texture and light/dark bands may reflect impurities or foliation; crystal structure is trigonal, with no cleavage in quartz.
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Physical properties
Mostly white to silvery gray with brown staining and a vitreous-to-dull luster; quartz hardness is 7 Mohs. The coarse, irregular texture and light/dark bands may reflect impurities or foliation; crystal structure is trigonal, with no cleavage in quartz.
Formation & geological history
Typically forms when quartz sandstone is recrystallized under heat and pressure during metamorphism, welding its grains together. The image alone cannot establish its age or confirm the rock identification.
Uses & applications
Quartzite is used as building and paving stone, road aggregate, and silica feedstock; attractive pieces may be collected or used decoratively.
Geological facts
Quartzite is notably durable, and grains in true quartzite fracture through rather than around their original boundaries.
Field identification & locations
A hard, quartz-rich appearance supports quartzite identification; a scratch test can help distinguish it from softer rocks, though this specimen’s identity is uncertain from the photo. Quartzite occurs worldwide in metamorphic belts.
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