metamorphic
White quartz-rich rock, likely quartzite
Quartzite; predominantly quartz (SiO₂), possibly with minor feldspar or mica
AI-generated identification · may be incorrectWhite, opaque, fine- to medium-grained, with a dull to sugary vitreous luster; quartz hardness is Mohs 7, with no obvious cleavage and irregular fracture. The specimen appears water-worn and cannot be identified confidently beyond a quartz-rich rock from the image.
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Physical properties
White, opaque, fine- to medium-grained, with a dull to sugary vitreous luster; quartz hardness is Mohs 7, with no obvious cleavage and irregular fracture. The specimen appears water-worn and cannot be identified confidently beyond a quartz-rich rock from the image.
Formation & geological history
Formed when quartz-rich sandstone recrystallizes under heat and pressure, commonly during mountain-building; ages range from Precambrian to younger depending on the source terrain. It commonly occurs in metamorphic belts and resistant gravel deposits.
Uses & applications
Used as crushed stone, aggregate, paving and building material, and decorative stone; attractive pieces may be collected but this example has little gem value.
Geological facts
Quartzite is generally harder and more resistant to weathering than its sandstone precursor. A steel nail should not scratch it, while quartzite can scratch ordinary glass.
Field identification & locations
Common in mountain regions and stream or landscaping gravel. Look for fused quartz grains and a granular texture; dilute acid should not fizz unless carbonate minerals are present.
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