metamorphic
Quartz-rich rock fragment, possibly milky quartz or quartzite
Quartz (SiO₂); probable quartzite if recrystallized sandstone
AI-generated identification · may be incorrectWhite to pale gray, vitreous to dull luster, massive granular texture, and irregular fracture; quartz hardness is 7 Mohs, with no cleavage. The image does not clearly resolve grain boundaries or other minerals.
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Physical properties
White to pale gray, vitreous to dull luster, massive granular texture, and irregular fracture; quartz hardness is 7 Mohs, with no cleavage. The image does not clearly resolve grain boundaries or other minerals.
Formation & geological history
Likely a natural quartz or quartzite fragment; quartzite forms when quartz sandstone is metamorphosed and recrystallized under heat and pressure, commonly during regional mountain-building. Its precise age and setting cannot be determined from the photograph.
Uses & applications
Quartz is used in glass, ceramics, electronics, abrasives, and engineered stone; quartzite is used as durable aggregate, building stone, countertops, and decorative material.
Geological facts
The specimen appears angular and weathered, with thin layered or fractured surfaces that could indicate quartzite or quartz-bearing rock rather than a single crystal.
Field identification & locations
Test for hardness by attempting to scratch glass: quartz should scratch it; it will not be scratched by a steel knife. Common sources include quartz veins, metamorphic belts, and gravel deposits.
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