metamorphic
Weathered quartz-rich rock, likely quartzite or quartz vein fragment
Quartzite, composed predominantly of SiO₂; possible iron-oxide staining
AI-generated identification · may be incorrectTypically white, gray, tan, or rusty brown with a vitreous to dull luster; quartz grains are tightly interlocked, with no obvious cleavage. Hardness is about 7 Mohs and specific gravity is approximately 2.6; the specimen appears strongly weathered and iron-stained.
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Physical properties
Typically white, gray, tan, or rusty brown with a vitreous to dull luster; quartz grains are tightly interlocked, with no obvious cleavage. Hardness is about 7 Mohs and specific gravity is approximately 2.6; the specimen appears strongly weathered and iron-stained.
Formation & geological history
Quartzite forms when quartz-rich sandstone is metamorphosed under heat and pressure, commonly during regional mountain-building. Its exact age cannot be determined from the photograph; rusty colors result from oxidation of iron-bearing minerals or fractures.
Uses & applications
Used as crushed stone, aggregate, building stone, landscaping rock, and occasionally as lapidary material. This small, irregular specimen has minimal commercial value unless it has unusual locality significance.
Geological facts
Quartzite commonly resists weathering better than surrounding rocks, producing ridges, cobbles, and resistant outcrops. The tan-brown coating may be limonite/goethite rather than the rock’s primary color.
Field identification & locations
Look for extreme hardness, quartz-rich granular texture, and inability to scratch quartz or glass; unlike sandstone, fresh fractures usually break across grains rather than around them. Common worldwide in metamorphic belts and quartz-rich terrains.
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