metamorphic
Weathered quartz-rich rock, possibly quartzite or vein quartz
Quartzite (mostly SiO₂), but exact identification is uncertain from the image
AI-generated identification · may be incorrectHardness about 7 Mohs; pale tan, cream, and white with a vitreous to dull weathered luster. Massive, nonfoliated texture; quartz has no cleavage and commonly shows irregular fracture.
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Physical properties
Hardness about 7 Mohs; pale tan, cream, and white with a vitreous to dull weathered luster. Massive, nonfoliated texture; quartz has no cleavage and commonly shows irregular fracture.
Formation & geological history
Likely formed by metamorphism of quartz-rich sandstone, or represents a strongly weathered quartz vein; age cannot be determined visually. Such rocks form in mountain-building zones and hydrothermal fracture systems.
Uses & applications
Used as aggregate, road stone, landscaping material, and occasionally dimension stone; attractive pieces may be collected but are generally low-value.
Geological facts
The tan coloration likely comes from iron-oxide staining, while white areas are relatively fresh quartz. A steel nail should not scratch it, though surface weathering can make this test misleading.
Field identification & locations
Common in metamorphic belts and quartz-vein exposures worldwide; test a clean surface for hardness and inspect whether grains are fused (quartzite) or crystalline and vein-like (quartz).
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