metamorphic
Weathered quartz-rich rock, possibly milky quartz/quartzite
Quartz (SiO₂), likely in a quartzite or silicified host rock
AI-generated identification · may be incorrectPale gray-white, opaque to translucent, granular texture with rusty iron-oxide staining; vitreous to dull luster and no obvious cleavage. Quartz hardness is Mohs 7; quartzite is typically dense and resistant, with specific gravity around 2.65.
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Physical properties
Pale gray-white, opaque to translucent, granular texture with rusty iron-oxide staining; vitreous to dull luster and no obvious cleavage. Quartz hardness is Mohs 7; quartzite is typically dense and resistant, with specific gravity around 2.65.
Formation & geological history
Likely formed when quartz-rich sediment was cemented or metamorphosed, followed by surface weathering and iron-oxide staining; exact age and locality cannot be determined from the image.
Uses & applications
Common quartzite is used as aggregate, building stone, landscaping rock, and decorative material; attractive pieces are collected but usually have low commercial value.
Geological facts
The specimen appears rounded from transport or weathering, and its rough granular surface is consistent with quartz grains rather than a single clear crystal.
Field identification & locations
Test a fresh edge with a steel knife or glass: quartz-rich material should resist scratching glass and show little reaction to dilute acid. Common worldwide, especially in quartzite belts and stream gravels.
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