sedimentary

Vein-bearing sandstone or quartzite cobble

Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite

AI-generated identification · may be incorrect

Tan-brown, fine- to medium-grained matrix crossed by thick white quartz veins. Quartz has Mohs hardness 7, vitreous luster, and no cleavage; the host appears moderately hard and granular, with likely specific gravity around 2.5–2.7.

Identified August 12, 2026More sedimentary →

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Physical properties

Formation & geological history

The host likely formed from compacted sand, then fractured and was mineralized by silica-rich fluids; stronger recrystallization would produce quartzite. Exact geological age cannot be determined from the image, and the specimen is likely a water-rounded cobble.

Uses & applications

Primarily a collector specimen, lapidary or decorative stone; quartz-rich material may be used as aggregate or building stone, though this piece is more valuable as an attractive display sample.

Geological facts

The contrasting white bands are quartz veins filling former cracks, while the brown color commonly reflects iron-oxide staining. Multiple vein generations may indicate repeated fracturing and fluid flow.

Field identification & locations

Identify it by its sandy/granular tan host, conspicuous hard white quartz bands, and lack of obvious crystals or layering; a steel scratch test and acid test can help distinguish quartzite from carbonate rock. Common in streams and eroded terrains near quartz-bearing sandstone or hydrothermal zones.