metamorphic
Weathered quartz-rich rock, likely quartzite
Quartzite (mostly microcrystalline quartz, SiO₂), possibly weathered quartz vein material
AI-generated identification · may be incorrectHardness about 7 Mohs; white to cream with rusty iron-oxide staining, vitreous to dull luster, massive granular texture, and no obvious cleavage. The specimen appears dense and strongly weathered, with possible cavities or fractured quartz veins.
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Physical properties
Hardness about 7 Mohs; white to cream with rusty iron-oxide staining, vitreous to dull luster, massive granular texture, and no obvious cleavage. The specimen appears dense and strongly weathered, with possible cavities or fractured quartz veins.
Formation & geological history
Likely formed when quartz-rich sandstone recrystallized during metamorphism, or from solidified hydrothermal quartz; iron staining developed during later weathering. Exact age and origin cannot be determined from the photograph.
Uses & applications
Used as crushed aggregate, road stone, building stone, and decorative rock; attractive pieces may be collected, though this specimen is not gem quality.
Geological facts
Quartzite commonly breaks across quartz grains rather than around them, producing a gritty fracture and resisting scratching. Rust-colored areas are likely limonite or hematite coatings.
Field identification & locations
Look for quartz grains fused into a hard, nonporous rock that scratches glass; quartz-rich river cobbles can appear similarly. Common in metamorphic terrains and gravel deposits worldwide.
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