sedimentary

Banded sandstone or quartzite fragment

Quartz-rich sandstone; possibly weakly metamorphosed quartzite

AI-generated identification · may be incorrect

Tan to brown, visibly layered, with granular quartz texture and earthy luster; quartz has Mohs hardness 7, while sandstone commonly shows variable hardness and porosity. No obvious crystal faces or cleavage are visible.

Identified August 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely deposited as successive sand layers and lithified by compaction and silica or iron-oxide cement; if metamorphosed, recrystallization produced quartzite. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as building and paving stone, wall stone, aggregate, and occasionally as a decorative specimen; this ordinary fragment has little jewelry value.

Geological facts

The dark bands may reflect clay-rich layers, iron staining, or changes in depositional conditions. Quartzite typically breaks across grains, whereas sandstone more readily crumbles along grain boundaries.

Field identification & locations

Identify it by sand-sized quartz grains, bedding, and layered coloration; a steel scratch test helps distinguish softer sandstone from quartzite, though it may damage the specimen. Common worldwide in sedimentary basins and metamorphic belts.