metamorphic

Quartz-rich chert or quartzite pebble

Microcrystalline quartz, SiO₂; possibly quartzite with iron-oxide staining

AI-generated identification · may be incorrect

Cream to tan, opaque, with gray-brown inclusions and a dull to slightly waxy luster; likely Mohs hardness 6.5–7, no visible cleavage, and conchoidal to irregular fracture. The rounded shape indicates natural stream or beach abrasion.

Identified September 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed by silicification of sediment (chert) or recrystallization of sandstone (quartzite), with later iron-oxide weathering; its precise geological age and source cannot be determined from the photograph.

Uses & applications

Common material for landscaping, lapidary work, flintknapping, and decorative collections; this specimen appears too small and ordinary for commercial construction or jewelry.

Geological facts

Quartz-rich rocks resist weathering and commonly survive as rounded pebbles after softer surrounding rock erodes. Dark patches may represent iron/manganese oxides or included darker minerals.

Field identification & locations

Test with a steel file or quartz point: genuine quartz-rich material should scratch glass and resist a steel knife. Common worldwide in gravel beds, rivers, beaches, and glacial deposits.