metamorphic
Weathered quartz-rich metamorphic rock (likely quartzite)
Quartzite, predominantly microcrystalline quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining
AI-generated identification · may be incorrectHardness about 7; pale cream to yellow-orange with rusty staining, granular texture, and vitreous to dull luster. Quartzite is nonfoliated and commonly fractures irregularly rather than along cleavage.
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Physical properties
Hardness about 7; pale cream to yellow-orange with rusty staining, granular texture, and vitreous to dull luster. Quartzite is nonfoliated and commonly fractures irregularly rather than along cleavage.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure during regional metamorphism; its exact geological age cannot be determined from the photograph. Yellow-orange colors likely reflect oxidation of iron-bearing impurities.
Uses & applications
Used as crushed stone, aggregate, paving, wall stone, and decorative slabs; attractive pieces may be collected, though this rough specimen has modest commercial value.
Geological facts
Quartzite commonly preserves the original sand-rich composition of sandstone while developing interlocking quartz grains, making it more resistant to weathering than its parent rock.
Field identification & locations
Identify it by its very high hardness, granular quartz appearance, and inability to scratch easily with a steel knife; unlike sandstone, it typically breaks through grains rather than around them. Common in metamorphic mountain belts worldwide.
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