metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar
AI-generated identification · may be incorrectGray-green to brown, translucent-to-opaque grains, vitreous luster, massive texture, and irregular fracture; quartz hardness is about Mohs 7, with no obvious cleavage. The image is too limited for confident mineral identification.
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Physical properties
Gray-green to brown, translucent-to-opaque grains, vitreous luster, massive texture, and irregular fracture; quartz hardness is about Mohs 7, with no obvious cleavage. The image is too limited for confident mineral identification.
Formation & geological history
Formed when quartz-rich sandstone recrystallized under heat and pressure during regional metamorphism; ages vary widely, commonly Precambrian to Paleozoic depending on locality.
Uses & applications
Used as crushed stone, aggregate, building stone, and decorative material; attractive pieces may be collected but are generally not gem-grade.
Geological facts
Quartzite is tougher and less porous than its sandstone precursor and commonly breaks across rather than around individual grains.
Field identification & locations
In the field, look for a very hard, granular rock that scratches glass and does not fizz with dilute acid; quartz-rich sandstone may show original bedding, whereas quartzite usually appears fused. Common worldwide in metamorphic mountain belts.
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