igneous or metamorphic

Rounded quartz-rich pebble, possibly weathered granite or quartzite

Indeterminate; likely quartz (SiO₂)-rich silicate rock

AI-generated identification · may be incorrect

Gray-brown, dull to weakly vitreous luster, fine-grained and heavily weathered with rounded stream-worn surfaces; apparent hardness about 6–7 Mohs. No definite cleavage or diagnostic crystal structure is visible; density is likely about 2.6–2.7 g/cm³.

Identified August 29, 2026More igneous or metamorphic →

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At a glance

Common name: Rounded quartz-rich pebble, possibly weathered granite or quartzite
Scientific name: Indeterminate; likely quartz (SiO₂)-rich silicate rock
Category: igneous or metamorphic
Identified: August 29, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; approximately $5–$20 if provenance, unusual texture, or confirmed mineral interest adds collector appeal.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Probably a naturally transported and abraded pebble derived from granitic or metamorphic bedrock; its exact geological age and formation environment cannot be determined from the photograph.

Uses & applications

Commonly used as a decorative or teaching specimen, landscaping stone, or craft pebble; it has little jewelry or industrial value unless testing reveals an attractive quartz variety.

Geological facts

The pale gray areas may be quartz, while the brown coloration likely reflects iron-oxide staining and weathering. The smooth shape indicates prolonged abrasion by water, ice, or sediment movement.

Field identification & locations

Test with a steel knife or glass: genuine quartz-rich material should scratch glass and resist a knife. A hand lens, streak test, acid test, and fresh broken surface would help distinguish quartzite from granite or other silicate rocks.