metamorphic
Quartz-rich rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, with minor iron-oxide staining and possible feldspar/mica
AI-generated identification · may be incorrectHardness about 7 Mohs; white to gray, tan, and reddish-brown; vitreous to sugary luster; interlocking quartz grains with no obvious cleavage, and uneven fracture. The granular texture and iron staining are consistent with quartzite, though a weathered quartz vein is possible.
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Physical properties
Hardness about 7 Mohs; white to gray, tan, and reddish-brown; vitreous to sugary luster; interlocking quartz grains with no obvious cleavage, and uneven fracture. The granular texture and iron staining are consistent with quartzite, though a weathered quartz vein is possible.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure, commonly during regional metamorphism; age depends on its parent sandstone and local geology. Iron-bearing fluids can produce the rusty red-brown patches.
Uses & applications
Used as crushed stone, road aggregate, landscaping rock, and durable building or paving stone; attractive pieces may be collected, though this specimen is not gem-grade.
Geological facts
Quartzite commonly resists weathering more strongly than surrounding rocks, forming ridges and prominent boulders. It can be confused with massive quartz or quartz-rich granite.
Field identification & locations
Look for a sugary, fused texture in which quartz grains break across their boundaries rather than crumbling around them; it should scratch ordinary glass. Common occurrences include mountain belts and ancient sandstone terrains worldwide.
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